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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
Jun. 30, 2021
Dec. 31, 2020
Financial Assets:    
Debt securities held-to-maturity $ 1,169,123 $ 968,466
Restricted equity investments 52,519 51,705
Financial Liabilities:    
Time deposits 956,429 1,372,783
Securities sold under agreements to repurchase with retail customers 141,475 128,454
Book Value    
Financial Assets:    
Cash and due from banks 1,084,029 1,272,134
Debt securities held-to-maturity 1,146,735 937,253
Restricted equity investments 52,519 51,705
Loans receivable, net and loans held-for-sale 7,775,844 7,750,381
Financial Liabilities:    
Deposits other than time deposits 8,458,857 8,054,833
Time deposits 956,429 1,372,783
Other borrowings 228,564 235,471
Securities sold under agreements to repurchase with retail customers 141,475 128,454
Level 1 Inputs    
Financial Assets:    
Cash and due from banks 1,084,029 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 141,475 128,454
Level 2 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 1,151,566 952,365
Restricted equity investments 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial Liabilities:    
Deposits other than time deposits 8,458,857 8,054,833
Time deposits 960,788 1,383,173
Other borrowings 263,757 251,798
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 17,557 16,101
Restricted equity investments 52,519 51,705
Loans receivable, net and loans held-for-sale 7,764,353 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