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Fair Value Measurements - Fair values for other financial instruments that are not measured at fair value on recurring basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Debt securities held-to-maturity, fair value $ 287,904 $ 268,803
Carrying Amount    
Assets:    
Debt securities held-to-maturity, fair value 283,533 274,407
Loans, net 8,750,464 8,322,198
Liabilities:    
Deposits 10,897,244 10,534,513
Federal Home Loan Bank advances   160,000
Long-term debt 212,664 267,189
Fair Value    
Assets:    
Debt securities held-to-maturity, fair value 287,904 268,803
Loans, net 8,714,592 8,277,387
Liabilities:    
Deposits 10,897,465 10,528,834
Federal Home Loan Bank advances   159,988
Long-term debt 217,665 278,996
Fair Value | Level 1    
Assets:    
Debt securities held-to-maturity, fair value 0 0
Loans, net 0 0
Liabilities:    
Deposits 0 0
Federal Home Loan Bank advances   0
Long-term debt 0 0
Fair Value | Level 2    
Assets:    
Debt securities held-to-maturity, fair value 287,904 268,803
Loans, net 0 0
Liabilities:    
Deposits 10,897,465 10,528,834
Federal Home Loan Bank advances   159,988
Long-term debt 0 0
Fair Value | Level 3    
Assets:    
Debt securities held-to-maturity, fair value 0 0
Loans, net 8,714,592 8,277,387
Liabilities:    
Deposits 0 0
Federal Home Loan Bank advances   0
Long-term debt $ 217,665 $ 278,996