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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
Sep. 30, 2021
Dec. 31, 2020
Financial Assets:    
Debt securities held-to-maturity $ 1,143,381 $ 968,466
Restricted equity investments 53,017 51,705
Financial Liabilities:    
Time deposits 855,442 1,372,783
Securities sold under agreements to repurchase with retail customers 143,292 128,454
Book Value    
Financial Assets:    
Cash and due from banks 981,126 1,272,134
Debt securities held-to-maturity 1,125,382 937,253
Restricted equity investments 53,017 51,705
Loans receivable, net and loans held-for-sale 8,153,389 7,750,381
Financial Liabilities:    
Deposits other than time deposits 8,918,655 8,054,833
Time deposits 855,442 1,372,783
Other borrowings 228,887 235,471
Securities sold under agreements to repurchase with retail customers 143,292 128,454
Level 1 Inputs    
Financial Assets:    
Cash and due from banks 981,126 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 143,292 128,454
Level 2 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 1,125,486 952,365
Restricted equity investments 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial Liabilities:    
Deposits other than time deposits 8,918,655 8,054,833
Time deposits 857,767 1,383,173
Other borrowings 256,577 251,798
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 17,895 16,101
Restricted equity investments 53,017 51,705
Loans receivable, net and loans held-for-sale 8,140,267 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