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DEPOSITS - Deposit Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
DEPOSITS & REPURCHASE AGREEMENTS    
Non-interest-bearing demand $ 812,301 $ 767,159
Interest-bearing demand 1,141,042 1,163,010
Savings 783,344 749,391
Certificates of deposit of $250 or more 66,052 65,815
Other certificates and time deposits 352,398 365,496
Total deposits $ 3,155,137 3,110,871
Repurchase agreement, term 1 day  
Pledged amount of mortgage backed securities $ 54,072 58,001
Securities under repurchase agreements $ 37,530 $ 38,339