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Loans and Allowance for Credit Losses on Loans - Loans by Credit Quality Grade (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 $ 1,843,845 $ 2,431,199
2021 5,613,763 4,606,457
2020 1,470,062 2,098,354
2019 1,790,242 1,602,034
2018 1,697,809 866,577
2017 and prior 5,232,422 5,939,419
Revolving lines of credit 6,386,524 5,205,040
Revolving lines of credit converted to term loans 107,460 122,881
Total 24,142,127 22,871,961
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 870,634 1,136,399
2021 4,026,891 3,171,323
2020 301,743 672,317
2019 504,235 365,908
2018 328,484 207,885
2017 and prior 398,848 308,275
Revolving lines of credit 5,036,180 3,984,187
Revolving lines of credit converted to term loans 44,517 51,267
Total 11,511,532 9,897,561
Commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 853,390 1,133,013
2021 4,017,274 3,157,150
2020 293,544 546,520
2019 434,095 319,246
2018 295,347 200,478
2017 and prior 379,247 289,795
Revolving lines of credit 4,971,573 3,960,706
Revolving lines of credit converted to term loans 35,847 41,377
Total 11,280,317 9,648,285
Commercial | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 9,384 2,650
2021 3,360 5,277
2020 7,696 23,129
2019 843 8,697
2018 0 39
2017 and prior 7,344 5,322
Revolving lines of credit 39,201 5,120
Revolving lines of credit converted to term loans 3,150 7,883
Total 70,978 58,117
Commercial | Substandard-accruing    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 7,860 0
2021 4,539 7,705
2020 503 102,619
2019 69,257 25,010
2018 23,026 6,202
2017 and prior 6,837 6,962
Revolving lines of credit 23,445 14,742
Revolving lines of credit converted to term loans 4,397 2,007
Total 139,864 165,247
Commercial | Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 736
2021 1,718 1,191
2020 0 49
2019 40 12,955
2018 10,111 1,166
2017 and prior 5,420 6,196
Revolving lines of credit 1,961 3,619
Revolving lines of credit converted to term loans 1,123 0
Total 20,373 25,912
Energy    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 89,871 71,750
2021 26,779 0
2020 0 0
2019 0 3
2018 0 0
2017 and prior 8,102 15,831
Revolving lines of credit 837,487 633,789
Revolving lines of credit converted to term loans 0 0
Total 962,239 721,373
Energy | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 89,871 71,750
2021 18,750 0
2020 0 0
2019 0 3
2018 0 0
2017 and prior 1,298 7,188
Revolving lines of credit 827,944 577,988
Revolving lines of credit converted to term loans 0 0
Total 937,863 656,929
Energy | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 6,804 0
Revolving lines of credit 0 27,421
Revolving lines of credit converted to term loans 0 0
Total 6,804 27,421
Energy | Substandard-accruing    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 0 8,643
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 0 8,643
Energy | Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 8,029 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 0 0
Revolving lines of credit 9,543 28,380
Revolving lines of credit converted to term loans 0 0
Total 17,572 28,380
Mortgage finance    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 44,918 289,042
2021 584,253 590,616
2020 291,404 656,445
2019 650,170 754,507
2018 972,308 332,001
2017 and prior 4,006,454 4,852,886
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 6,549,507 7,475,497
Mortgage finance | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 44,918 289,042
2021 584,253 590,616
2020 291,404 656,445
2019 650,170 754,507
2018 972,308 332,001
2017 and prior 3,861,831 4,852,886
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 6,404,884 7,475,497
Mortgage finance | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 0 0
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 0 0
Mortgage finance | Substandard-accruing    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 144,623 0
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 144,623 0
Mortgage finance | Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 0 0
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 0 0
Real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 838,422 934,008
2021 975,840 844,518
2020 876,915 769,592
2019 635,837 481,616
2018 397,017 326,691
2017 and prior 819,018 762,427
Revolving lines of credit 512,857 587,064
Revolving lines of credit converted to term loans 62,943 71,614
Total 5,118,849 4,777,530
Real estate | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 3,322,820  
Real estate | Commercial Real Estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 621,736 497,462
2021 572,504 576,344
2020 656,808 600,005
2019 511,457 294,005
2018 245,343 155,252
2017 and prior 463,050 451,042
Revolving lines of credit 73,715 73,988
Revolving lines of credit converted to term loans 23,102 25,970
Total 3,167,715 2,674,068
Real estate | Commercial Real Estate | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 2,218 0
2021 10,905 0
2020 46 291
2019 4,800 8,827
2018 14,072 20,089
2017 and prior 9,494 26,344
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 446 0
Total 41,981 55,551
Real estate | Commercial Real Estate | Substandard-accruing    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 17,850
2021 17,850 0
2020 0 0
2019 0 40,900
2018 26,317 37,393
2017 and prior 68,767 38,188
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 2,308
Total 112,934 136,639
Real estate | Commercial Real Estate | Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 190 198
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 190 198
Real estate | Residential Homebuilder Finance    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 610,093  
Real estate | Residential Homebuilder Finance | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 47,888 155,595
2021 117,866 44,362
2020 23,022 9,693
2019 13,735 8,565
2018 7,648 0
2017 and prior 2,471 12,732
Revolving lines of credit 394,540 460,888
Revolving lines of credit converted to term loans 0 0
Total 607,170 691,835
Real estate | Residential Homebuilder Finance | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 623 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 0 0
Revolving lines of credit 2,300 0
Revolving lines of credit converted to term loans 0 0
Total 2,923 0
Real estate | Residential Homebuilder Finance | Substandard-accruing    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 0 0
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 0 0
Real estate | Residential Homebuilder Finance | Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 0 0
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 0 0
Real estate | Other Financing Receivable    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 874,878  
Real estate | Other Financing Receivable | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 134,821 166,202
2021 162,251 148,811
2020 127,499 119,017
2019 77,889 106,343
2018 83,726 61,723
2017 and prior 179,466 139,723
Revolving lines of credit 38,245 47,653
Revolving lines of credit converted to term loans 27,185 29,595
Total 831,082 819,067
Real estate | Other Financing Receivable | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 7,365
2020 12,972 0
2019 0 0
2018 0 845
2017 and prior 17,534 4,982
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 30,506 13,192
Real estate | Other Financing Receivable | Substandard-accruing    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 6,424
2020 0 0
2019 0 0
2018 0 16,922
2017 and prior 1,080 20,184
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 1,080 43,530
Real estate | Other Financing Receivable | Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 2,641
2017 and prior 0 1,450
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 12,210 13,741
Total 12,210 17,832
Real estate | Secured by 1-4 family    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 311,058  
Real estate | Secured by 1-4 family | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 31,759 96,899
2021 93,841 60,659
2020 56,568 40,586
2019 27,956 22,976
2018 19,911 31,826
2017 and prior 75,462 65,910
Revolving lines of credit 4,057 4,535
Revolving lines of credit converted to term loans 0 0
Total 309,554 323,391
Real estate | Secured by 1-4 family | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 553
2020 0 0
2019 0 0
2018 0 0
2017 and prior 1,156 291
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 1,156 844
Real estate | Secured by 1-4 family | Substandard-accruing    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 167 1,203
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total 167 1,203
Real estate | Secured by 1-4 family | Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 and prior 181 180
Revolving lines of credit 0 0
Revolving lines of credit converted to term loans 0 0
Total $ 181 $ 180