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SECURITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis $ 1,145,448 $ 1,118,572
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 7,234 10,444
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (8,686) (8,526)
Available-for-sale securities, debt securities 1,143,996 1,120,490
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]    
Available-for-sale equity securities, amortized cost basis 47,858 30,522
Available-for-sale equity securities, accumulated gross unrealized gain, before tax 19,296 5,331
Available-for-sale equity securities, accumulated gross unrealized loss, before tax (1,613) (1,886)
Available-for-sale securities, equity securities 65,541 33,967
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Available-for-sale securities, amortized cost basis 1,193,306 1,149,094
Available-for-sale securities, accumulated gross unrealized gain, before tax 26,530 15,775
Available-for-sale securities, accumulated gross unrealized loss, before tax (10,299) (10,412)
Available-for-securities 1,209,537 1,154,457
Held-to-maturity Securities, Unclassified [Abstract]    
Held-to-maturity securities 334,368 131,652
Held-to-maturity securities, accumulated unrecognized holding gain 6,816 5,286
Held-to-maturity securities, accumulated unrecognized holding loss (3,504) (34)
Held-to-maturity securities, fair value 337,680 136,904
Available-for-sale Securities and Held-to-maturity Securities [Abstract]    
Held to maturity and available for sale securities amortized cost 1,527,674 1,280,746
Held to maturity and available for sale securities, gross unrealized gain 33,346 21,061
Held to maturity and available for sale securities, gross unrealized losses (13,803) (10,446)
Available for sale securities and held to maturity securities 1,547,217 1,291,361
Municipal bonds and obligations    
Held-to-maturity Securities, Unclassified [Abstract]    
Held-to-maturity securities 203,463 94,642
Held-to-maturity securities, accumulated unrecognized holding gain 3,939 3,359
Held-to-maturity securities, accumulated unrecognized holding loss (2,416) (34)
Held-to-maturity securities, fair value 204,986 97,967
Agency collateralized mortgage obligations    
Held-to-maturity Securities, Unclassified [Abstract]    
Held-to-maturity securities 75,655 68
Held-to-maturity securities, accumulated unrecognized holding gain 1,281 3
Held-to-maturity securities, accumulated unrecognized holding loss (411) 0
Held-to-maturity securities, fair value 76,525 71
Tax advantaged economic development bonds    
Held-to-maturity Securities, Unclassified [Abstract]    
Held-to-maturity securities 35,278 36,613
Held-to-maturity securities, accumulated unrecognized holding gain 1,596 1,924
Held-to-maturity securities, accumulated unrecognized holding loss 0 0
Held-to-maturity securities, fair value 36,874 38,537
Other bonds and obligations    
Held-to-maturity Securities, Unclassified [Abstract]    
Held-to-maturity securities 325 329
Held-to-maturity securities, accumulated unrecognized holding gain 0 0
Held-to-maturity securities, accumulated unrecognized holding loss 0 0
Held-to-maturity securities, fair value 325 329
Municipal bonds and obligations    
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis 117,910 99,922
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 2,955 4,763
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (1,049) (124)
Available-for-sale securities, debt securities 119,816 104,561
Agency collateralized mortgage obligations    
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis 652,680 833,633
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 2,522 4,957
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (3,291) (5,554)
Available-for-sale securities, debt securities 651,911 833,036
Agency mortgage-backed securities    
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis 230,308 127,274
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 557 542
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (2,181) (987)
Available-for-sale securities, debt securities 228,684 126,829
Held-to-maturity Securities, Unclassified [Abstract]    
Held-to-maturity securities 9,102  
Held-to-maturity securities, accumulated unrecognized holding gain 0  
Held-to-maturity securities, accumulated unrecognized holding loss (243)  
Held-to-maturity securities, fair value 8,859  
Agency commercial mortgage-backed securities    
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis 65,673 0
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 229 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (1,368) 0
Available-for-sale securities, debt securities 64,534 0
Held-to-maturity Securities, Unclassified [Abstract]    
Held-to-maturity securities 10,545  
Held-to-maturity securities, accumulated unrecognized holding gain 0  
Held-to-maturity securities, accumulated unrecognized holding loss (434)  
Held-to-maturity securities, fair value 10,111  
Corporate bonds    
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis 56,320 42,849
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 408 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (722) (1,826)
Available-for-sale securities, debt securities 56,006 41,023
Trust preferred securities    
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis 11,578 11,719
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 368 182
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (59) (1)
Available-for-sale securities, debt securities 11,887 11,900
Other bonds and obligations    
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]    
Available-for-sale debt securities, amortized cost basis 10,979 3,175
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 195 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax (16) (34)
Available-for-sale securities, debt securities $ 11,158 $ 3,141