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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Carrying Amount    
Financial Assets:    
FHLB stock $ 21,203 $ 21,964
Level 1 | Carrying Amount    
Financial Assets:    
Cash and cash equivalents 461,068 437,334
Level 1 | Estimated Fair Value    
Financial Assets:    
Cash and cash equivalents 461,068 437,334
Level 2 | Carrying Amount    
Financial Assets:    
Loans held for sale 19,141 22,785
Customers' liabilities on acceptances 2,771 2,899
Financial Liabilities:    
Noninterest-bearing deposits 2,963,947 2,900,241
Saving and other interest bearing demand deposits 3,771,155 3,703,352
Time deposits 3,968,675 4,038,442
FHLB advances 703,850 754,290
Subordinated debentures 100,067 99,808
Accrued interest payable 10,592 10,863
Bank's liabilities on acceptances outstanding 2,771 2,899
Level 2 | Estimated Fair Value    
Financial Assets:    
Loans held for sale 20,291 24,492
Customers' liabilities on acceptances 2,771 2,899
Financial Liabilities:    
Noninterest-bearing deposits 2,963,947 2,900,241
Saving and other interest bearing demand deposits 3,771,155 3,703,352
Time deposits 3,963,545 4,036,664
FHLB advances 698,287 749,486
Subordinated debentures 100,067 99,808
Accrued interest payable 10,592 10,863
Bank's liabilities on acceptances outstanding 2,771 2,899
Level 2/3 | Carrying Amount    
Financial Assets:    
Accrued interest receivable 25,683 26,880
Level 2/3 | Estimated Fair Value    
Financial Assets:    
Accrued interest receivable 25,683 26,880
Level 3 | Carrying Amount    
Financial Assets:    
Loans receivable - net 10,471,008 10,463,989
Financial Liabilities:    
Servicing Assets, Fair Value Disclosure 25,941  
Level 3 | Estimated Fair Value    
Financial Assets:    
Loans receivable - net 10,633,834 10,666,642
Financial Liabilities:    
Servicing Assets, Fair Value Disclosure 25,941  
Other Investments [Member] | Level 2 | Carrying Amount    
Financial Assets:    
Interest bearing deposits in other financial institutions and other investments   44,202
Other Investments [Member] | Level 2/3 | Carrying Amount    
Financial Assets:    
Interest bearing deposits in other financial institutions and other investments 43,958  
Other Investments [Member] | Level 2/3 | Estimated Fair Value    
Financial Assets:    
Interest bearing deposits in other financial institutions and other investments $ 43,630 $ 43,773