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Loans Receivable and Allowance for Credit Losses - Additional Information (Details)
 3 Months Ended 9 Months Ended
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