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Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Minimum number of days past due for loans to be considered nonperforming 90 days  
Credit Quality by Loan Class [Abstract]    
2021/2020 $ 697,245 $ 1,927,429
2020/2019 1,722,430 1,312,819
2019/2018 1,237,919 949,810
2018/2017 874,540 750,728
2017/2016 681,635 515,688
Prior 1,646,957 1,262,066
Revolving Loans Amortized Cost Basis 746,562 749,657
Revolving Loans Converted to Term 26,171 30,688
Total 7,633,459 7,498,885
C&I [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 113,286 352,323
2020/2019 321,528 195,227
2019/2018 171,349 106,502
2018/2017 95,289 50,153
2017/2016 41,852 35,040
Prior 63,953 39,712
Revolving Loans Amortized Cost Basis 334,807 346,233
Revolving Loans Converted to Term 10,676 426
Total 1,152,740 1,125,616
C&I [Member] | Pass [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 113,273 331,921
2020/2019 305,135 182,329
2019/2018 157,578 91,230
2018/2017 82,451 41,856
2017/2016 34,635 32,625
Prior 55,540 32,609
Revolving Loans Amortized Cost Basis 310,850 322,674
Revolving Loans Converted to Term 10,149 412
Total 1,069,611 1,035,656
C&I [Member] | Special Mention [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 13 20,064
2020/2019 15,988 6,534
2019/2018 6,099 5,053
2018/2017 4,576 4,702
2017/2016 4,149 1,624
Prior 4,001 2,830
Revolving Loans Amortized Cost Basis 17,420 13,614
Revolving Loans Converted to Term 0 0
Total 52,246 54,421
C&I [Member] | Substandard [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 0 338
2020/2019 405 6,364
2019/2018 7,672 10,219
2018/2017 8,262 3,388
2017/2016 2,865 791
Prior 4,411 4,272
Revolving Loans Amortized Cost Basis 6,537 9,945
Revolving Loans Converted to Term 527 14
Total 30,679 35,331
C&I [Member] | Doubtful [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 0 0
2020/2019 0 0
2019/2018 0 0
2018/2017 0 207
2017/2016 203 0
Prior 1 1
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 204 208
CRE [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 132,195 472,506
2020/2019 456,029 412,425
2019/2018 419,889 296,712
2018/2017 285,729 342,604
2017/2016 321,513 255,045
Prior 696,059 496,867
Revolving Loans Amortized Cost Basis 136,940 115,926
Revolving Loans Converted to Term 2,860 20,200
Total 2,451,214 2,412,285
CRE [Member] | Pass [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 132,195 469,919
2020/2019 452,951 361,187
2019/2018 356,643 256,154
2018/2017 260,570 271,874
2017/2016 253,673 212,197
Prior 535,309 383,690
Revolving Loans Amortized Cost Basis 134,394 113,128
Revolving Loans Converted to Term 2,860 4,034
Total 2,128,595 2,072,183
CRE [Member] | Special Mention [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 0 2,051
2020/2019 2,544 44,034
2019/2018 41,189 22,260
2018/2017 7,508 55,039
2017/2016 54,121 36,830
Prior 88,045 43,537
Revolving Loans Amortized Cost Basis 1,293 1,297
Revolving Loans Converted to Term 0 11,524
Total 194,700 216,572
CRE [Member] | Substandard [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 0 536
2020/2019 534 5,307
2019/2018 20,160 18,298
2018/2017 17,651 15,691
2017/2016 13,719 6,018
Prior 65,288 62,168
Revolving Loans Amortized Cost Basis 1,253 1,501
Revolving Loans Converted to Term 0 4,642
Total 118,605 114,161
CRE [Member] | Doubtful [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 0 0
2020/2019 0 1,897
2019/2018 1,897 0
2018/2017 0 0
2017/2016 0 0
Prior 7,417 7,472
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 9,314 9,369
PPP [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 218,938 430,810
2020/2019 317,556 0
2019/2018 0 0
2018/2017 0 0
2017/2016 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 536,494 430,810
PPP [Member] | Pass [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 218,938 430,810
2020/2019 317,556 0
2019/2018 0 0
2018/2017 0 0
2017/2016 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 536,494 430,810
Auto [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 98,676 198,240
2020/2019 183,418 315,174
2019/2018 280,673 202,985
2018/2017 173,991 116,502
2017/2016 94,748 45,932
Prior 41,451 13,250
Revolving Loans Amortized Cost Basis 21 22
Revolving Loans Converted to Term 0 0
Total 872,978 892,105
Auto [Member] | Performing [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 98,666 197,881
2020/2019 183,147 314,034
2019/2018 280,077 201,850
2018/2017 173,240 115,977
2017/2016 94,084 45,495
Prior 41,451 13,250
Revolving Loans Amortized Cost Basis 21 22
Revolving Loans Converted to Term 0 0
Total 870,686 888,509
Auto [Member] | Nonperforming [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 10 359
2020/2019 271 1,140
2019/2018 596 1,135
2018/2017 751 525
2017/2016 664 437
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 2,292 3,596
Other Consumer [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 67,050 234,967
2020/2019 209,157 178,829
2019/2018 160,363 127,856
2018/2017 112,978 55,941
2017/2016 48,159 14,345
Prior 26,656 17,547
Revolving Loans Amortized Cost Basis 14,933 18,598
Revolving Loans Converted to Term 41 71
Total 639,337 648,154
Other Consumer [Member] | Performing [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 67,050 234,628
2020/2019 208,960 178,411
2019/2018 159,896 127,549
2018/2017 112,634 55,676
2017/2016 47,920 14,255
Prior 26,535 17,414
Revolving Loans Amortized Cost Basis 14,923 18,588
Revolving Loans Converted to Term 24 71
Total 637,942 646,592
Other Consumer [Member] | Nonperforming [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 0 339
2020/2019 197 418
2019/2018 467 307
2018/2017 344 265
2017/2016 239 90
Prior 121 133
Revolving Loans Amortized Cost Basis 10 10
Revolving Loans Converted to Term 17 0
Total 1,395 1,562
Residential [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 67,100 238,583
2020/2019 234,742 211,164
2019/2018 205,645 215,755
2018/2017 206,553 185,528
2017/2016 175,363 165,326
Prior 818,838 694,690
Revolving Loans Amortized Cost Basis 259,861 268,878
Revolving Loans Converted to Term 12,594 9,991
Total 1,980,696 1,989,915
Residential [Member] | Performing [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 67,100 237,338
2020/2019 233,363 210,505
2019/2018 204,995 213,437
2018/2017 204,255 182,993
2017/2016 173,135 164,424
Prior 808,168 684,495
Revolving Loans Amortized Cost Basis 259,861 268,878
Revolving Loans Converted to Term 12,532 9,991
Total 1,963,409 1,972,061
Residential [Member] | Nonperforming [Member]    
Credit Quality by Loan Class [Abstract]    
2021/2020 0 1,245
2020/2019 1,379 659
2019/2018 650 2,318
2018/2017 2,298 2,535
2017/2016 2,228 902
Prior 10,670 10,195
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 62 0
Total $ 17,287 $ 17,854