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Loans Receivable and Allowance for Credit Losses - Collateral-Dependent Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 13,702,629   $ 13,563,213
Interest income reversals due to loans being placed on nonaccrual status 973 $ 37  
Total      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 125,541   79,652
Real Estate Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 121,843   73,340
Other Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 3,698   6,312
Real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,811,423   8,772,134
Real estate | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 52,671   54,795
Real estate | Residential | Total      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 0   0
Real estate | Residential | Real Estate Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 0   0
Real estate | Residential | Other Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 0   0
Real estate | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,489,638   8,425,959
Real estate | Commercial | Total      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 91,562   55,945
Real estate | Commercial | Real Estate Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 91,562   55,945
Real estate | Commercial | Other Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 0   0
Real estate | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 269,114   291,380
Real estate | Construction | Total      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18,120   8,122
Real estate | Construction | Real Estate Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18,120   8,122
Real estate | Construction | Other Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 0   0
Commercial business      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 4,346,244   4,157,787
Commercial business | Total      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 13,849   14,130
Commercial business | Real Estate Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 10,151   7,818
Commercial business | Other Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 3,698   6,312
Residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 501,000   582,232
Residential mortgage | Total      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,992   1,440
Residential mortgage | Real Estate Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,992   1,440
Residential mortgage | Other Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 0   0
Consumer and other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 43,962   51,060
Consumer and other | Total      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18   15
Consumer and other | Real Estate Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18   15
Consumer and other | Other Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 0   $ 0