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Fair Value Measurements - Book Value and Estimated Fair Value of Bank's Significant Financial Instruments Not Recorded at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial assets:    
Debt securities held-to-maturity $ 1,152,744 $ 968,466
Restricted equity investments 53,195 51,705
Financial liabilities:    
Time deposits 775,001 1,372,783
Securities sold under agreements to repurchase with retail customers 118,769 128,454
Book Value    
Financial assets:    
Cash and due from banks 204,949 1,272,134
Debt securities held-to-maturity 1,139,193 937,253
Restricted equity investments 53,195 51,705
Loans receivable, net and loans held-for-sale 8,583,352 7,750,381
Financial liabilities:    
Deposits other than time deposits 8,957,815 8,054,833
Time deposits 775,001 1,372,783
Other borrowings 229,141 235,471
Securities sold under agreements to repurchase with retail customers 118,769 128,454
Level 1 Inputs    
Financial assets:    
Cash and due from banks 204,949 1,272,134
Debt securities held-to-maturity 0 0
Restricted equity investments 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial liabilities:    
Deposits other than time deposits 0 0
Time deposits 0 0
Other borrowings 0 0
Securities sold under agreements to repurchase with retail customers 118,769 128,454
Level 2 Inputs    
Financial assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 1,138,529 952,365
Restricted equity investments 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial liabilities:    
Deposits other than time deposits 8,957,815 8,054,833
Time deposits 773,766 1,383,173
Other borrowings 251,491 251,798
Securities sold under agreements to repurchase with retail customers 0 0
Level 3 Inputs    
Financial assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 14,215 16,101
Restricted equity investments 53,195 51,705
Loans receivable, net and loans held-for-sale 8,533,506 7,806,743
Financial liabilities:    
Deposits other than time deposits 0 0
Time deposits 0 0
Other borrowings 0 0
Securities sold under agreements to repurchase with retail customers $ 0 $ 0