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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, 2020
Dec. 31, 2019
Financial Assets:    
Debt securities held-to-maturity $ 902,418 $ 777,290
Restricted equity investments, at cost 67,505 62,356
Financial Liabilities:    
Time deposits 1,561,767 935,632
Securities sold under agreements to repurchase with retail customers 142,823 71,739
Book Value    
Financial Assets:    
Cash and due from banks 980,870 120,544
Debt securities held-to-maturity 871,688 768,873
Restricted equity investments, at cost 67,505 62,356
Loans receivable, net and loans held-for-sale 8,332,153 6,207,680
Financial Liabilities:    
Deposits other than time deposits 7,721,521 5,393,145
Time deposits 1,561,767 935,632
Federal Home Loan Bank advances and other borrowings 590,393 616,061
Securities sold under agreements to repurchase with retail customers 142,823 71,739
Level 1 Inputs    
Financial Assets:    
Cash and due from banks 980,870 120,544
Debt securities held-to-maturity 0 0
Restricted equity investments, at cost 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
Federal Home Loan Bank advances and other borrowings 0 0
Securities sold under agreements to repurchase with retail customers 142,823 71,739
Level 2 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 900,099 774,805
Restricted equity investments, at cost 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial Liabilities:    
Deposits other than time deposits 7,721,521 5,393,145
Time deposits 1,578,325 936,318
Federal Home Loan Bank advances and other borrowings 619,102 626,225
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 2,320 2,485
Restricted equity investments, at cost 67,505 62,356
Loans receivable, net and loans held-for-sale 8,400,464 6,173,237
Financial Liabilities:    
Deposits other than time deposits 0 0
Time deposits 0 0
Federal Home Loan Bank advances and other borrowings 0 0
Securities sold under agreements to repurchase with retail customers $ 0 $ 0