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Fair Value Measurements - Book Value and Estimated Fair Value of Bank's Significant Financial Instruments Not Recorded at Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financial Assets:    
Debt securities held-to-maturity $ 896,812 $ 832,815
Restricted equity investments, at cost 55,663 56,784
Financial Liabilities:    
Time deposits 949,593 866,244
Securities sold under agreements to repurchase with retail customers 66,174 61,760
Book Value    
Financial Assets:    
Cash and due from banks 134,235 120,792
Debt securities held-to-maturity 900,614 846,810
Restricted equity investments, at cost 55,663 56,784
Loans receivable, net and loans held-for-sale 5,968,830 5,579,222
Financial Liabilities:    
Deposits other than time deposits 5,340,892 4,948,325
Time deposits 949,593 866,244
Federal Home Loan Bank advances and other borrowings 517,595 548,913
Securities sold under agreements to repurchase with retail customers 66,174 61,760
Level 1 Inputs    
Financial Assets:    
Cash and due from banks 134,235 120,792
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 66,174 61,760
Level 2 Inputs    
Financial Assets:    
Cash and due from banks 0 0
Debt securities held-to-maturity 888,177 830,999
Restricted equity investments, at cost 0 0
Loans receivable, net and loans held-for-sale 0 0
Financial Liabilities:    
Deposits other than time deposits 5,340,892 4,948,325
Time deposits 941,672 853,678
Federal Home Loan Bank advances and other borrowings 525,476 554,692
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 8,635 1,816
Restricted equity investments, at cost 55,663 56,784
Loans receivable, net and loans held-for-sale 5,893,831 5,474,306
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