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Loans - Loan Portfolio by Risk-Rating Grades (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Loan portfolio by risk-rating grades      
Total Loans $ 18,975,248   $ 19,047,039
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Total Loans 3,260 $ 1,129  
Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 776,940   4,023,461
Year two 3,982,863   2,224,385
Year three 2,077,487   1,613,579
Year four 1,521,527   2,824,521
Year five 2,581,986   1,409,845
Prior 2,529,257   1,399,412
Revolving Loans 1,672,905   1,682,972
Revolving Loans Converted to Term 28,518   28,558
Total Loans 15,171,483   15,206,733
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 301   5
Year two 38   1,519
Year three 392   4,009
Year four 676   4,801
Year five 615   5,379
Prior 181   5,650
Revolving Loans 0   5,356
Revolving Loans Converted to Term 264   0
Total Loans 2,467   26,719
Pass      
Loan portfolio by risk-rating grades      
Year one 751,747   3,938,663
Year two 3,924,760   2,169,260
Year three 2,038,003   1,579,008
Year four 1,488,094   2,708,076
Year five 2,465,770   1,372,837
Prior 2,409,784   1,301,504
Revolving Loans 1,600,471   1,613,561
Revolving Loans Converted to Term 22,926   23,105
Total Loans 14,701,555   14,706,014
Special Mention      
Loan portfolio by risk-rating grades      
Year one 9,481   53,198
Year two 20,967   20,576
Year three 20,347   8,296
Year four 7,974   54,025
Year five 49,068   13,253
Prior 34,367   23,199
Revolving Loans 34,117   28,881
Revolving Loans Converted to Term 24   0
Total Loans 176,345   201,428
Classified      
Loan portfolio by risk-rating grades      
Year one 15,712   31,600
Year two 37,136   34,549
Year three 19,137   26,275
Year four 25,459   62,420
Year five 67,148   23,755
Prior 85,106   74,709
Revolving Loans 38,317   40,530
Revolving Loans Converted to Term 5,568   5,453
Total Loans 293,583   299,291
Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 82,036   439,585
Year two 424,789   262,671
Year three 248,638   375,267
Year four 355,520   817,495
Year five 795,045   548,701
Prior 1,247,120   748,928
Revolving Loans 633,734   631,508
Revolving Loans Converted to Term 16,883   16,151
Total Loans 3,803,765   3,840,306
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   53
Year two 156   341
Year three 61   187
Year four 139   132
Year five 115   198
Prior 161   1,110
Revolving Loans 16   19
Revolving Loans Converted to Term 145   0
Total Loans 793   2,040
Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 82,036   438,029
Year two 423,457   261,260
Year three 247,447   366,121
Year four 346,939   799,781
Year five 778,118   543,829
Prior 1,222,250   725,717
Revolving Loans 633,492   631,189
Revolving Loans Converted to Term 14,541   14,436
Total Loans 3,748,280   3,780,362
Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   1,556
Year two 1,332   1,411
Year three 1,191   9,146
Year four 8,581   17,714
Year five 16,927   4,872
Prior 24,870   23,211
Revolving Loans 242   319
Revolving Loans Converted to Term 2,342   1,715
Total Loans 55,485   59,944
Commercial and industrial | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 144,024   664,836
Year two 621,402   267,767
Year three 263,587   189,777
Year four 171,598   250,976
Year five 240,658   129,199
Prior 216,053   102,743
Revolving Loans 1,195,723   1,188,474
Revolving Loans Converted to Term 24,285   24,554
Total Loans 2,877,330   2,818,326
Commercial and industrial | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 18,146   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 1   0
Revolving Loans Converted to Term 0   0
Total Loans 18,147   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial and industrial | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 18,146   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 1   0
Revolving Loans Converted to Term 0   0
Total Loans 18,147   0
Commercial and industrial | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial and industrial | Commercial and industrial | Subject to Credit Risk Assessment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   5
Year two 19   1,519
Year three 41   3,681
Year four 342   4,268
Year five 223   5,223
Prior 181   3,676
Revolving Loans 0   1,155
Revolving Loans Converted to Term 264   0
Total Loans 1,070   19,527
Commercial and industrial | Commercial and industrial | Pass      
Loan portfolio by risk-rating grades      
Year one 142,877   648,151
Year two 589,459   262,528
Year three 259,519   185,033
Year four 167,325   244,440
Year five 234,281   127,075
Prior 210,533   99,108
Revolving Loans 1,127,502   1,122,605
Revolving Loans Converted to Term 21,152   21,189
Total Loans 2,752,648   2,710,129
Commercial and industrial | Commercial and industrial | Special Mention      
Loan portfolio by risk-rating grades      
Year one 1,087   15,095
Year two 15,075   2,348
Year three 2,262   802
Year four 742   608
Year five 100   424
Prior 1,962   1,869
Revolving Loans 33,734   28,499
Revolving Loans Converted to Term 24   0
Total Loans 54,986   49,645
Commercial and industrial | Commercial and industrial | Classified      
Loan portfolio by risk-rating grades      
Year one 60   1,590
Year two 16,868   2,891
Year three 1,806   3,942
Year four 3,531   5,928
Year five 6,277   1,700
Prior 3,558   1,766
Revolving Loans 34,487   37,370
Revolving Loans Converted to Term 3,109   3,365
Total Loans 69,696   58,552
Construction and land development | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 205,209   891,047
Year two 894,698   450,335
Year three 342,153   235,317
Year four 159,867   92,070
Year five 63,496   22,381
Prior 27,711   9,220
Revolving Loans 64,403   61,638
Revolving Loans Converted to Term 1,505   1,505
Total Loans 1,759,042   1,763,513
Construction and land development | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 9,882   66,151
Year two 68,487   33,823
Year three 26,725   20,283
Year four 14,903   6,156
Year five 4,955   10,321
Prior 12,966   3,943
Revolving Loans 516   507
Revolving Loans Converted to Term 1,153   939
Total Loans 139,587   142,123
Construction and land development | Residential | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 80,517   235,859
Year two 185,835   34,917
Year three 24,186   0
Year four 23,105   0
Year five 0   0
Prior 0   0
Revolving Loans 8,607   8,288
Revolving Loans Converted to Term 0   0
Total Loans 322,250   279,064
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   106
Year four 0   242
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   348
Construction and land development | Residential | Pass      
Loan portfolio by risk-rating grades      
Year one 80,517   233,826
Year two 183,844   34,917
Year three 24,186   0
Year four 23,105   0
Year five 0   0
Prior 0   0
Revolving Loans 8,607   8,288
Revolving Loans Converted to Term 0   0
Total Loans 320,259   277,031
Construction and land development | Residential | Special Mention      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Construction and land development | Residential | Classified      
Loan portfolio by risk-rating grades      
Year one 0   2,033
Year two 1,991   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 1,991   2,033
Construction and land development | Residential | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 8,511   54,380
Year two 58,024   30,881
Year three 23,990   13,955
Year four 9,029   1,265
Year five 332   1,914
Prior 1,879   0
Revolving Loans 375   375
Revolving Loans Converted to Term 1,153   939
Total Loans 103,293   103,709
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Construction and land development | Residential | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 8,511   54,380
Year two 58,024   30,881
Year three 23,990   13,955
Year four 9,029   1,265
Year five 332   1,914
Prior 1,879   0
Revolving Loans 375   375
Revolving Loans Converted to Term 1,153   939
Total Loans 103,293   103,709
Construction and land development | Residential | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Construction and land development | Other | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 124,692   655,188
Year two 708,863   415,418
Year three 317,967   235,317
Year four 136,762   92,070
Year five 63,496   22,381
Prior 27,711   9,220
Revolving Loans 55,796   53,350
Revolving Loans Converted to Term 1,505   1,505
Total Loans 1,436,792   1,484,449
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   26
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   26
Construction and land development | Other | Pass      
Loan portfolio by risk-rating grades      
Year one 117,306   644,909
Year two 708,481   410,878
Year three 313,327   226,065
Year four 129,071   88,922
Year five 60,398   22,381
Prior 27,582   9,094
Revolving Loans 55,553   53,106
Revolving Loans Converted to Term 1,505   1,505
Total Loans 1,413,223   1,456,860
Construction and land development | Other | Special Mention      
Loan portfolio by risk-rating grades      
Year one 551   457
Year two 380   3,948
Year three 4,073   727
Year four 703   0
Year five 0   0
Prior 110   107
Revolving Loans 243   244
Revolving Loans Converted to Term 0   0
Total Loans 6,060   5,483
Construction and land development | Other | Classified      
Loan portfolio by risk-rating grades      
Year one 6,835   9,822
Year two 2   592
Year three 567   8,525
Year four 6,988   3,148
Year five 3,098   0
Prior 19   19
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 17,509   22,106
Construction and land development | Other | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 1,371   11,771
Year two 10,463   2,942
Year three 2,735   6,328
Year four 5,874   4,891
Year five 4,623   8,407
Prior 11,087   3,943
Revolving Loans 141   132
Revolving Loans Converted to Term 0   0
Total Loans 36,294   38,414
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 1   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 1   0
Construction and land development | Other | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 1,371   11,771
Year two 10,463   2,921
Year three 2,735   6,247
Year four 5,844   4,744
Year five 4,323   8,403
Prior 11,087   3,932
Revolving Loans 141   132
Revolving Loans Converted to Term 0   0
Total Loans 35,964   38,150
Construction and land development | Other | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   21
Year three 0   81
Year four 30   147
Year five 300   4
Prior 0   11
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 330   264
Real Estate - 1-4 Family Mortgage      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Total Loans 525 309  
Real Estate - 1-4 Family Mortgage | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 56,452   269,213
Year two 261,888   150,538
Year three 138,930   137,194
Year four 127,971   191,230
Year five 180,656   116,779
Prior 167,337   71,816
Revolving Loans 107,710   107,516
Revolving Loans Converted to Term 509   462
Total Loans 1,041,453   1,044,748
Real Estate - 1-4 Family Mortgage | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 39,522   333,353
Year two 327,882   213,474
Year three 209,551   345,975
Year four 333,161   805,063
Year five 785,041   534,744
Prior 1,220,647   733,503
Revolving Loans 611,258   609,124
Revolving Loans Converted to Term 15,603   15,049
Total Loans 3,542,665   3,590,285
Real Estate - 1-4 Family Mortgage | First lien | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 53,896   251,292
Year two 246,052   142,403
Year three 130,996   129,819
Year four 120,740   186,606
Year five 176,571   114,068
Prior 163,242   69,209
Revolving Loans 3,605   3,230
Revolving Loans Converted to Term 0   0
Total Loans 895,102   896,627
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   34
Year four 44   149
Year five 0   64
Prior 0   78
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 44   325
Real Estate - 1-4 Family Mortgage | First lien | Pass      
Loan portfolio by risk-rating grades      
Year one 53,793   249,929
Year two 244,663   139,985
Year three 128,252   128,534
Year four 118,340   183,517
Year five 173,586   112,078
Prior 158,931   66,988
Revolving Loans 3,605   3,230
Revolving Loans Converted to Term 0   0
Total Loans 881,170   884,261
Real Estate - 1-4 Family Mortgage | First lien | Special Mention      
Loan portfolio by risk-rating grades      
Year one 95   263
Year two 206   226
Year three 465   525
Year four 348   216
Year five 212   530
Prior 567   76
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 1,893   1,836
Real Estate - 1-4 Family Mortgage | First lien | Classified      
Loan portfolio by risk-rating grades      
Year one 8   1,100
Year two 1,183   2,192
Year three 2,279   760
Year four 2,052   2,873
Year five 2,773   1,460
Prior 3,744   2,145
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 12,039   10,530
Real Estate - 1-4 Family Mortgage | First lien | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 38,929   331,496
Year two 326,385   209,270
Year three 205,390   343,867
Year four 331,129   801,481
Year five 781,563   533,558
Prior 1,214,158   727,798
Revolving Loans 29   0
Revolving Loans Converted to Term 0   0
Total Loans 2,897,583   2,947,470
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   74
Year three 47   28
Year four 101   58
Year five 113   0
Prior 49   69
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 310   229
Real Estate - 1-4 Family Mortgage | First lien | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 38,929   329,942
Year two 325,087   207,890
Year three 204,211   335,040
Year four 322,783   783,952
Year five 764,966   528,690
Prior 1,189,823   705,399
Revolving Loans 29   0
Revolving Loans Converted to Term 0   0
Total Loans 2,845,828   2,890,913
Real Estate - 1-4 Family Mortgage | First lien | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   1,554
Year two 1,298   1,380
Year three 1,179   8,827
Year four 8,346   17,529
Year five 16,597   4,868
Prior 24,335   22,399
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 51,755   56,557
Real Estate - 1-4 Family Mortgage | Junior lien | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 2,555   15,567
Year two 14,445   7,330
Year three 7,138   6,502
Year four 6,366   3,854
Year five 3,746   1,966
Prior 3,109   2,348
Revolving Loans 428   405
Revolving Loans Converted to Term 0   0
Total Loans 37,787   37,972
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 19   0
Year three 0   11
Year four 0   142
Year five 0   0
Prior 0   278
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 19   431
Real Estate - 1-4 Family Mortgage | Junior lien | Pass      
Loan portfolio by risk-rating grades      
Year one 2,545   14,819
Year two 13,875   6,978
Year three 6,712   5,915
Year four 5,782   3,734
Year five 3,629   1,909
Prior 2,386   1,740
Revolving Loans 428   405
Revolving Loans Converted to Term 0   0
Total Loans 35,357   35,500
Real Estate - 1-4 Family Mortgage | Junior lien | Special Mention      
Loan portfolio by risk-rating grades      
Year one 10   514
Year two 512   132
Year three 207   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 729   646
Real Estate - 1-4 Family Mortgage | Junior lien | Classified      
Loan portfolio by risk-rating grades      
Year one 0   234
Year two 58   220
Year three 219   587
Year four 584   120
Year five 117   57
Prior 723   608
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 1,701   1,826
Real Estate - 1-4 Family Mortgage | Junior lien | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 593   1,857
Year two 1,497   4,088
Year three 4,046   1,745
Year four 1,670   2,868
Year five 2,771   968
Prior 4,152   3,445
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 14,729   14,971
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   53
Year three 0   0
Year four 0   0
Year five 0   0
Prior 11   7
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 11   60
Real Estate - 1-4 Family Mortgage | Junior lien | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 593   1,857
Year two 1,497   4,081
Year three 4,035   1,689
Year four 1,670   2,868
Year five 2,771   968
Prior 3,834   3,050
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 14,400   14,513
Real Estate - 1-4 Family Mortgage | Junior lien | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   7
Year three 11   56
Year four 0   0
Year five 0   0
Prior 318   395
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 329   458
Real Estate - 1-4 Family Mortgage | Home equity | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 1   2,354
Year two 1,391   805
Year three 796   873
Year four 865   770
Year five 339   745
Prior 986   259
Revolving Loans 103,677   103,881
Revolving Loans Converted to Term 509   462
Total Loans 108,564   110,149
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   92
Prior 0   93
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   185
Real Estate - 1-4 Family Mortgage | Home equity | Pass      
Loan portfolio by risk-rating grades      
Year one 1   2,354
Year two 1,391   805
Year three 796   873
Year four 865   267
Year five 266   745
Prior 986   259
Revolving Loans 102,689   103,497
Revolving Loans Converted to Term 269   411
Total Loans 107,263   109,211
Real Estate - 1-4 Family Mortgage | Home equity | Special Mention      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Real Estate - 1-4 Family Mortgage | Home equity | Classified      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   503
Year five 73   0
Prior 0   0
Revolving Loans 988   384
Revolving Loans Converted to Term 240   51
Total Loans 1,301   938
Real Estate - 1-4 Family Mortgage | Home equity | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   116
Year three 115   363
Year four 362   714
Year five 707   218
Prior 2,337   2,260
Revolving Loans 611,229   609,124
Revolving Loans Converted to Term 15,603   15,049
Total Loans 630,353   627,844
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   148
Prior 21   79
Revolving Loans 0   0
Revolving Loans Converted to Term 120   0
Total Loans 141   227
Real Estate - 1-4 Family Mortgage | Home equity | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   116
Year three 115   184
Year four 183   714
Year five 707   218
Prior 2,233   1,960
Revolving Loans 610,987   608,808
Revolving Loans Converted to Term 13,261   13,334
Total Loans 627,486   625,334
Real Estate - 1-4 Family Mortgage | Home equity | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   179
Year four 179   0
Year five 0   0
Prior 104   300
Revolving Loans 242   316
Revolving Loans Converted to Term 2,342   1,715
Total Loans 2,867   2,510
Commercial real estate - owner occupied      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Total Loans 1,136 461  
Commercial real estate - owner occupied | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 235,122   1,696,446
Year two 1,662,878   753,232
Year three 741,602   597,999
Year four 626,111   1,748,638
Year five 1,584,214   676,417
Prior 1,187,054   657,353
Revolving Loans 96,538   113,358
Revolving Loans Converted to Term 2,024   2,037
Total Loans 6,135,543   6,245,480
Commercial real estate - owner occupied | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Commercial real estate - owner occupied | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 136,133   501,919
Year two 541,997   602,513
Year three 591,215   453,290
Year four 435,877   541,607
Year five 512,962   465,069
Prior 931,102   558,280
Revolving Loans 208,484   211,986
Revolving Loans Converted to Term 195   0
Total Loans 3,357,965   3,334,664
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 301   0
Year two 0   0
Year three 153   177
Year four 290   0
Year five 392   0
Prior 0   1,339
Revolving Loans 0   4,201
Revolving Loans Converted to Term 0   0
Total Loans 1,136   5,717
Commercial real estate - owner occupied | Commercial real estate - owner occupied | Pass      
Loan portfolio by risk-rating grades      
Year one 130,417   497,708
Year two 537,710   586,917
Year three 572,459   438,247
Year four 421,563   520,128
Year five 493,726   447,885
Prior 886,302   527,129
Revolving Loans 207,061   210,685
Revolving Loans Converted to Term 0   0
Total Loans 3,249,238   3,228,699
Commercial real estate - owner occupied | Commercial real estate - owner occupied | Special Mention      
Loan portfolio by risk-rating grades      
Year one 5,631   3,807
Year two 4,010   6,263
Year three 6,658   3,993
Year four 3,951   15,360
Year five 12,287   2,971
Prior 17,558   13,295
Revolving Loans 56   0
Revolving Loans Converted to Term 0   0
Total Loans 50,151   45,689
Commercial real estate - owner occupied | Commercial real estate - owner occupied | Classified      
Loan portfolio by risk-rating grades      
Year one 85   404
Year two 277   9,333
Year three 12,098   11,050
Year four 10,363   6,119
Year five 6,949   14,213
Prior 27,242   17,856
Revolving Loans 1,367   1,301
Revolving Loans Converted to Term 195   0
Total Loans 58,576   60,276
Commercial real estate - owner occupied | Commercial real estate - owner occupied | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Commercial real estate - owner occupied | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Commercial real estate - owner occupied | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Multi family | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 37,626   394,699
Year two 379,105   71,999
Year three 54,071   123,963
Year four 136,853   548,165
Year five 468,519   135,587
Prior 198,472   115,521
Revolving Loans 4,000   2,845
Revolving Loans Converted to Term 0   0
Total Loans 1,278,646   1,392,779
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Multi family | Pass      
Loan portfolio by risk-rating grades      
Year one 37,516   360,750
Year two 378,332   69,068
Year three 51,173   123,477
Year four 136,364   548,165
Year five 468,519   135,587
Prior 197,702   114,726
Revolving Loans 4,000   2,845
Revolving Loans Converted to Term 0   0
Total Loans 1,273,606   1,354,618
Commercial real estate - owner occupied | Multi family | Special Mention      
Loan portfolio by risk-rating grades      
Year one 110   33,062
Year two 0   2,918
Year three 2,889   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 2,999   35,980
Commercial real estate - owner occupied | Multi family | Classified      
Loan portfolio by risk-rating grades      
Year one 0   887
Year two 773   13
Year three 9   486
Year four 489   0
Year five 0   0
Prior 770   795
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 2,041   2,181
Commercial real estate - owner occupied | Multi family | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Multi family | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Multi family | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Other | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 197,496   1,301,747
Year two 1,283,773   681,233
Year three 687,531   474,036
Year four 489,258   1,200,473
Year five 1,115,695   540,830
Prior 988,582   541,832
Revolving Loans 92,538   110,513
Revolving Loans Converted to Term 2,024   2,037
Total Loans 4,856,897   4,852,701
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 198   0
Year four 0   0
Year five 0   0
Prior 0   160
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 198   160
Commercial real estate - owner occupied | Other | Pass      
Loan portfolio by risk-rating grades      
Year one 186,775   1,286,217
Year two 1,267,005   657,184
Year three 681,579   470,862
Year four 485,576   1,118,903
Year five 1,031,365   525,177
Prior 925,362   482,460
Revolving Loans 90,979   108,900
Revolving Loans Converted to Term 0   0
Total Loans 4,668,641   4,649,703
Commercial real estate - owner occupied | Other | Special Mention      
Loan portfolio by risk-rating grades      
Year one 1,997   0
Year two 784   4,741
Year three 3,793   2,249
Year four 2,230   37,841
Year five 36,469   9,328
Prior 14,170   7,852
Revolving Loans 84   138
Revolving Loans Converted to Term 0   0
Total Loans 59,527   62,149
Commercial real estate - owner occupied | Other | Classified      
Loan portfolio by risk-rating grades      
Year one 8,724   15,530
Year two 15,984   19,308
Year three 2,159   925
Year four 1,452   43,729
Year five 47,861   6,325
Prior 49,050   51,520
Revolving Loans 1,475   1,475
Revolving Loans Converted to Term 2,024   2,037
Total Loans 128,729   140,849
Commercial real estate - owner occupied | Other | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Other | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Commercial real estate - owner occupied | Other | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Consumer      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Total Loans 330 $ 265  
Consumer | Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   2
Year four 103   0
Year five 0   0
Prior 0   0
Revolving Loans 47   0
Revolving Loans Converted to Term 0   0
Total Loans 150   2
Consumer | Not Subject to Credit Risk Assessment      
Loan portfolio by risk-rating grades      
Year one 14,486   40,081
Year two 28,420   15,374
Year three 12,362   9,009
Year four 7,456   6,276
Year five 5,049   3,636
Prior 13,507   11,482
Revolving Loans 21,959   21,877
Revolving Loans Converted to Term 127   163
Total Loans 103,366   107,898
Consumer | Not Subject to Credit Risk Assessment | Performing Loans      
Loan portfolio by risk-rating grades      
Year one 14,486   40,079
Year two 28,386   15,371
Year three 12,361   9,006
Year four 7,430   6,238
Year five 5,019   3,636
Prior 13,394   11,376
Revolving Loans 21,959   21,874
Revolving Loans Converted to Term 127   163
Total Loans 103,162   107,743
Consumer | Not Subject to Credit Risk Assessment | Non-Performing Loans      
Loan portfolio by risk-rating grades      
Year one 0   2
Year two 34   3
Year three 1   3
Year four 26   38
Year five 30   0
Prior 113   106
Revolving Loans 0   3
Revolving Loans Converted to Term 0   0
Total Loans 204   155
Consumer | Consumer | Subject to Credit Risk Assessment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Consumer | Consumer | Pass      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   2
Year four 103   0
Year five 0   0
Prior 0   0
Revolving Loans 47   0
Revolving Loans Converted to Term 0   0
Total Loans 150   2
Consumer | Consumer | Special Mention      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Consumer | Consumer | Classified      
Loan portfolio by risk-rating grades      
Year one 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term 0   0
Total Loans 0   0
Consumer | Consumer | Not Subject to Credit Risk Assessment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Year one 0   53
Year two 156   214
Year three 14   159
Year four 38   74
Year five 2   50
Prior 79   955
Revolving Loans 16   19
Revolving Loans Converted to Term 25   0
Total Loans $ 330   $ 1,524