SECURITIES - Contractual Maturities of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available for Sale, Amortized Cost
Amortized Cost, Within one year	$ 16,380
Amortized Cost,One through five years	49,193
Amortized Cost, Six through ten years	129,994
Amortized Cost, After ten years	144,455
Amortized Cost	905,857	$ 846,982
Fair Value, Within one year	16,522
Fair Value, One through five years	51,360
Fair Value, Six through ten years	137,422
Fair Value, After ten years	152,457
Fair Value	925,279	867,760
Parent Company
Available for Sale, Amortized Cost
Fair Value	149	149
U. S. government agency
Available for Sale, Amortized Cost
Amortized Cost	499	652
Fair Value	504	661
State and municipal
Available for Sale, Amortized Cost
Amortized Cost	332,999	316,048
Fair Value	350,733	334,298
Mortgage-backed securities-residential (Government Sponsored Entity)
Available for Sale, Amortized Cost
Amortized Cost, Debt securities without a single maturity date	332,525
Amortized Cost	332,525	178,534
Fair Value, Debt securities without a single maturity date	334,080
Fair Value	334,080	182,172
Collateralized mortgage obligations (Government Sponsored Entity)
Available for Sale, Amortized Cost
Amortized Cost, Debt securities without a single maturity date	228,621
Amortized Cost	228,621	344,556
Fair Value, Debt securities without a single maturity date	228,749
Fair Value	228,749	343,437
Equity securities
Available for Sale, Amortized Cost
Amortized Cost, Equity securities	4,689
Amortized Cost	4,689	4,689
Available-for-sale Securities, Equity Securities	4,689
Fair Value	$ 4,689	$ 4,689