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Loans and Allowance for Credit Losses on Loans - Credit Risk Profile of Loan Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Credit risk profile of portfolio    
2023 $ 603,735 $ 2,115,132
2022 1,832,813 1,954,111
2021 1,868,867 454,876
2020 338,696 136,666
2019 59,163 74,113
Prior 112,293 58,347
Revolving Loans 5,950,658 5,406,308
Loans 10,766,225 10,199,553
Net Charge-Offs    
2022   8,896
2021   274
2020 925 586
Prior   22
Revolving Loans   13
Net Charge-Offs 925 9,791
Pass    
Credit risk profile of portfolio    
2023 571,416 1,947,008
2022 1,677,746 1,902,347
2021 1,802,354 409,166
2020 293,914 135,601
2019 58,156 73,977
Prior 110,398 55,806
Revolving Loans 5,896,764 5,355,754
Loans 10,410,748 9,879,659
Special Mention    
Credit risk profile of portfolio    
2023 32,319 130,842
2022 117,800 12,709
2021 38,061 8,692
2020 8,689 187
2019 157 74
Prior 1,688 2,053
Revolving Loans 33,408 36,710
Loans 232,122 191,267
Substandard    
Credit risk profile of portfolio    
2023   37,282
2022 37,267 39,055
2021 28,452 37,018
2020 36,093 878
2019 850 62
Prior 207 438
Revolving Loans 20,486 13,844
Loans 123,355 128,577
Doubtful    
Credit risk profile of portfolio    
Prior   50
Loans   50
Mortgage warehouse lines of credit    
Credit risk profile of portfolio    
Revolving Loans 1,142,994 752,468
Loans 1,142,994 752,468
Mortgage warehouse lines of credit | Pass    
Credit risk profile of portfolio    
Revolving Loans 1,142,994 752,468
Loans 1,142,994 752,468
Residential real estate    
Credit risk profile of portfolio    
2023 1,780 31,011
2022 32,353 10,086
2021 9,793 6,573
2020 6,175 22,725
2019 21,315 3,357
Prior 7,618 10,120
Revolving Loans 1,242,266 1,240,433
Loans 1,321,300 1,324,305
Net Charge-Offs    
Prior   21
Revolving Loans   13
Net Charge-Offs   34
Residential real estate | Pass    
Credit risk profile of portfolio    
2023 1,780 31,011
2022 32,353 10,086
2021 9,793 6,573
2020 6,175 22,725
2019 21,315 3,298
Prior 7,400 9,340
Revolving Loans 1,240,994 1,239,161
Loans 1,319,810 1,322,194
Residential real estate | Special Mention    
Credit risk profile of portfolio    
2019   59
Prior 218 492
Loans 218 551
Residential real estate | Substandard    
Credit risk profile of portfolio    
Prior   288
Revolving Loans 1,272 1,272
Loans 1,272 1,560
Multi-family financing    
Credit risk profile of portfolio    
2023 306,730 1,201,353
2022 1,065,586 793,997
2021 790,990 223,277
2020 129,287 77,340
2019 9,070 29,764
Prior 36,057 9,932
Revolving Loans 1,758,886 1,670,497
Loans 4,096,606 4,006,160
Net Charge-Offs    
2022   8,400
Net Charge-Offs   8,400
Multi-family financing | Pass    
Credit risk profile of portfolio    
2023 298,730 1,094,698
2022 957,019 762,448
2021 734,071 208,343
2020 114,353 77,340
2019 9,070 29,764
Prior 34,587 8,455
Revolving Loans 1,731,470 1,646,445
Loans 3,879,300 3,827,493
Multi-family financing | Special Mention    
Credit risk profile of portfolio    
2023 8,000 94,973
2022 96,900 3,189
2021 28,559 8,400
2020 8,400  
Prior 1,470 1,477
Revolving Loans 20,777 24,052
Loans 164,106 132,091
Multi-family financing | Substandard    
Credit risk profile of portfolio    
2023   11,682
2022 11,667 28,360
2021 28,360 6,534
2020 6,534  
Revolving Loans 6,639  
Loans 53,200 46,576
Healthcare financing    
Credit risk profile of portfolio    
2023 282,923 814,060
2022 672,888 1,016,418
2021 946,382 138,980
2020 127,598  
2019   14,563
Prior 14,459  
Revolving Loans 420,435 372,668
Loans 2,464,685 2,356,689
Healthcare financing | Pass    
Credit risk profile of portfolio    
2023 258,604 752,591
2022 626,388 996,273
2021 936,880 110,197
2020 98,815  
2019   14,563
Prior 14,459  
Revolving Loans 398,904 351,110
Loans 2,334,050 2,224,734
Healthcare financing | Special Mention    
Credit risk profile of portfolio    
2023 24,319 35,869
2022 20,900 9,520
2021 9,502  
Revolving Loans 12,631 12,658
Loans 67,352 58,047
Healthcare financing | Substandard    
Credit risk profile of portfolio    
2023   25,600
2022 25,600 10,625
2021   28,783
2020 28,783  
Revolving Loans 8,900 8,900
Loans 63,283 73,908
Commercial and commercial real estate    
Credit risk profile of portfolio    
2023 4,469 51,110
2022 54,002 119,456
2021 116,571 79,309
2020 72,889 22,204
2019 20,210 21,150
Prior 34,229 17,200
Revolving Loans 1,364,381 1,332,652
Loans 1,666,751 1,643,081
Net Charge-Offs    
2022   496
2021   274
2020 925 586
Net Charge-Offs 925 1,356
Commercial and commercial real estate | Pass    
Credit risk profile of portfolio    
2023 4,469 51,110
2022 54,002 119,386
2021 116,479 77,316
2020 71,824 21,154
2019 19,203 21,088
Prior 34,169 17,066
Revolving Loans 1,360,706 1,328,980
Loans 1,660,852 1,636,100
Commercial and commercial real estate | Special Mention    
Credit risk profile of portfolio    
2021   292
2020 289 172
2019 157  
Prior   84
Loans 446 548
Commercial and commercial real estate | Substandard    
Credit risk profile of portfolio    
2022   70
2021 92 1,701
2020 776 878
2019 850 62
Prior 60  
Revolving Loans 3,675 3,672
Loans 5,453 6,383
Commercial and commercial real estate | Doubtful    
Credit risk profile of portfolio    
Prior   50
Loans   50
Agricultural production and real estate    
Credit risk profile of portfolio    
2023 7,833 16,850
2022 7,875 9,825
2021 5,103 6,490
2020 2,722 14,267
2019 8,566 5,237
Prior 15,662 16,753
Revolving Loans 18,216 33,728
Loans 65,977 103,150
Agricultural production and real estate | Pass    
Credit risk profile of portfolio    
2023 7,833 16,850
2022 7,875 9,825
2021 5,103 6,490
2020 2,722 14,267
2019 8,566 5,237
Prior 15,515 16,606
Revolving Loans 18,216 33,728
Loans 65,830 103,003
Agricultural production and real estate | Substandard    
Credit risk profile of portfolio    
Prior 147 147
Loans 147 147
Consumer and margin loans    
Credit risk profile of portfolio    
2023   748
2022 109 4,329
2021 28 247
2020 25 130
2019 2 42
Prior 4,268 4,342
Revolving Loans 3,480 3,862
Loans 7,912 13,700
Net Charge-Offs    
Prior   1
Net Charge-Offs   1
Consumer and margin loans | Pass    
Credit risk profile of portfolio    
2023   748
2022 109 4,329
2021 28 247
2020 25 115
2019 2 27
Prior 4,268 4,339
Revolving Loans 3,480 3,862
Loans $ 7,912 13,667
Consumer and margin loans | Special Mention    
Credit risk profile of portfolio    
2020   15
2019   15
Loans   30
Consumer and margin loans | Substandard    
Credit risk profile of portfolio    
Prior   3
Loans   $ 3