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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
Mar. 31, 2023
Dec. 31, 2022
Financial Assets:    
Debt securities held-to-maturity $ 1,149,673 $ 1,110,041
Restricted equity investments 115,750 109,278
Financial Liabilities:    
Time deposits 2,386,967 1,542,020
Securities sold under agreements to repurchase with customers 70,938 69,097
Level 1 Inputs    
Financial Assets:    
Cash and due from banks 496,193 167,946
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
FHLB advances and other borrowings 0 0
Securities sold under agreements to repurchase with customers 70,938 69,097
Level 2 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 1,140,797 1,097,984
Restricted equity investments 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial Liabilities:    
Deposits other than time deposits 7,606,128 8,133,186
Time deposits 2,356,875 1,504,601
FHLB advances and other borrowings 1,524,195 1,416,384
Securities sold under agreements to repurchase with customers 0 0
Level 3 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 8,876 12,057
Restricted equity investments 115,750 109,278
Loans receivable, net and loans held-for-sale 9,196,738 9,103,137
Financial Liabilities:    
Deposits other than time deposits 0 0
Time deposits 0 0
FHLB advances and other borrowings 0 0
Securities sold under agreements to repurchase with customers 0 0
Book Value    
Financial Assets:    
Cash and due from banks 496,193 167,946
Debt securities held-to-maturity 1,245,424 1,221,138
Restricted equity investments 115,750 109,278
Loans receivable, net and loans held-for-sale 9,988,834 9,869,408
Financial Liabilities:    
Deposits other than time deposits 7,606,128 8,133,186
Time deposits 2,386,967 1,542,020
FHLB advances and other borrowings 1,542,229 1,406,569
Securities sold under agreements to repurchase with customers $ 70,938 $ 69,097