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Loans Receivable and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 USD ($) loan | Mar. 31, 2022 loan | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) loan security | Sep. 30, 2021 USD ($) loan security
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss, writeoff | $ 550,000 |  |  | $ 44,583,000 | $ 2,765,000 | $ 60,896,000
Reasonable and supportable period at which point loss assumptions revert back to historical loss information |  |  |  |  | 2 years |
Reversion period |  |  |  |  | 1 year |
Non-modeled loans as percentage of total loan portfolio (less than) | 2.00% |  |  |  | 2.00% |
Positive or negative qualitative adjustment of the Loss Migration Ratio | 0.25% |  |  |  | 0.25% |
Financing receivable, balance threshold to determine individual evaluation for impairment | $ 1,000,000 |  |  |  | $ 1,000,000 |
Total TDR loans | 53,580,000 |  | $ 65,513,000 |  | $ 53,580,000 |
Number of loans | loan |  |  |  |  | 3 | 14
Allowance for TDRs | 4,000,000 |  | 2,700,000 |  | $ 4,000,000 |
ACL for TDRs modified during period |  |  |  | 0 | 782,000 | $ 89,000
Total charge-offs of TDR loans modified | 0 |  |  | 0 | 0 | 0
ACL for the TDRs that had payment defaults | 771,000 |  |  | 51,000 | 771,000 | 84,000
Total charge offs for TDR loans that had payment defaults | 0 |  |  | 0 | 0 | 0
Accrued interest receivable on loans | 35,700,000 |  | 36,200,000 |  | 35,700,000 |
Net deferred fees/costs | 9,300,000 |  | 6,200,000 |  | 9,300,000 |
Total loans | 15,491,187,000 |  | 13,952,743,000 |  | 15,491,187,000 |
Increase (Decrease) in Finance Receivables |  |  |  |  | 1,540,000,000 |
Transfer from loans receivable to loans held for sale |  |  |  |  | 219,287,000 | 374,034,000
Loans held for sale, at the lower of cost or fair value | 41,989,000 |  | 99,049,000 |  | 41,989,000 |
Guaranteed portion of SBA loans excluded from Nonaccrual loans | 9,900,000 |  | 19,500,000 |  | 9,900,000 |
Recoveries of charge offs | 331,000 |  |  | 1,905,000 | 21,376,000 | $ 4,629,000
Troubled Debt Restructuring Concession, Type, Payment Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 29,593,000 |  | 31,955,000 |  | 29,593,000 |
Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 17,228,000 |  | 26,411,000 |  | 17,228,000 |
6500 Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Recoveries of charge offs |  |  |  |  | 17,300,000 |
COVID-19 Pandemic |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Amount of loans modified | 800,000 |  | 22,800,000 |  | $ 800,000 |
Number of loans |  |  |  |  | 1 |
SBA, Paycheck Protection Program Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Net deferred fees/costs | 130,000 |  | 6,700,000 |  | $ 130,000 |
Small Business Administration Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for sale, at the lower of cost or fair value | 41,100,000 |  |  |  | 41,100,000 |
Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Loans held for sale, at the lower of cost or fair value | $ 900,000 |  |  |  | $ 900,000 |
Real Estate Loan | Troubled Debt Restructuring Concession, Type, Payment Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Number of loans | security |  |  |  |  | 1 | 7
ACL for TDRs modified during period |  |  |  |  | $ 2,000,000 | $ 643,000
Real Estate Loan | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Number of loans | 0 |  |  |  | 2 | 7
ACL for TDRs modified during period |  |  |  |  | $ 3,500,000 | $ 11,900,000
Real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss, writeoff | $ 185,000 |  | 29,600,000 | 41,655,000 | 1,936,000 | 56,645,000
Total loans | 9,504,893,000 |  | 9,105,931,000 |  | 9,504,893,000 |
Recoveries of charge offs | 176,000 |  |  | 1,113,000 | 18,853,000 | $ 2,588,000
Real estate | TDR Loans on Accrual Status |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 15,451,000 |  | 43,806,000 |  | 15,451,000 |
Real estate | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Payment Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 5,410,000 |  | 23,196,000 |  | 5,410,000 |
Real estate | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 4,979,000 |  | 15,449,000 |  | 4,979,000 |
Real estate | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 9,216,194,000 |  | 8,816,080,000 |  | $ 9,216,194,000 |
Real estate | Commercial | Hotel & motel |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Number of loans | loan |  |  |  |  | 1 | 0
Real estate | Commercial | TDR Loans on Accrual Status |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 15,500,000 |  | 43,800,000 |  | $ 15,500,000 |
Number of loans | loan |  | 31 |  |  | 28 |
Real estate | Residential |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Number of loans | loan |  |  |  |  | 0 | 0
Total loans | 75,488,000 |  | 69,199,000 |  | $ 75,488,000 |
Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss, writeoff | 262,000 |  |  | 1,895,000 | $ 611,000 | $ 3,077,000
Number of loans | loan |  |  |  |  | 1 | 3
Total loans | 5,124,421,000 |  | 4,208,674,000 |  | $ 5,124,421,000 |
Recoveries of charge offs | 147,000 |  |  | 778,000 | 2,486,000 | $ 1,859,000
Commercial business | SBA, Paycheck Protection Program Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 5,900,000 |  | 228,100,000 |  | 5,900,000 |
Commercial business | TDR Loans on Accrual Status |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 9,921,000 |  | 8,413,000 |  | $ 9,921,000 |
Number of loans | loan |  | 19 |  |  | 13 |
Commercial business | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Payment Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 532,000 |  | 790,000 |  | $ 532,000 |
Commercial business | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 9,193,000 |  | 7,284,000 |  | 9,193,000 |
Consumer and other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss, writeoff | 81,000 |  |  | 110,000 | $ 196,000 | $ 251,000
Number of loans | loan |  |  |  |  | 0 | 5
Total loans | 38,064,000 |  | 58,512,000 |  | $ 38,064,000 |
Recoveries of charge offs | 8,000 |  |  | 14,000 | 37,000 | $ 182,000
Consumer and other | TDR Loans on Accrual Status |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 272,000 |  | 199,000 |  | $ 272,000 |
Number of loans | loan |  | 10 |  |  | 9 |
Consumer and other | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Payment Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 15,000 |  | 16,000 |  | $ 15,000 |
Consumer and other | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 257,000 |  | 183,000 |  | 257,000 |
Residential Portfolio Segment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit loss, writeoff | 22,000 |  |  | 923,000 | $ 22,000 | $ 923,000
Number of loans | loan |  |  |  |  | 0 | 0
Total loans | 823,809,000 |  | 579,626,000 |  | $ 823,809,000 |
Recoveries of charge offs | 0 |  |  | $ 0 | 0 | $ 0
Residential Portfolio Segment | TDR Loans on Accrual Status |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 0 |  | 0 |  | 0 |
Residential Portfolio Segment | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Payment Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | 0 |  | 0 |  | 0 |
Residential Portfolio Segment | TDR Loans on Accrual Status | Troubled Debt Restructuring Concession, Type, Maturity/ Amortization Concession [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total TDR loans | $ 0 |  | $ 0 |  | $ 0 |
Minimum |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Temporary modifications, period of interest only payments |  |  |  |  | 3 months |
Maximum |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Temporary modifications, period of interest only payments |  |  |  |  | 6 months |

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