SECURITIES (Securities Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized Cost
Maturing in one year or less	$ 1,751
Maturing after one year through five years	230
Maturing after five years through ten years	1,200
Maturing after ten years through twenty years	0
Maturing after twenty years	26,959
Total with Maturity Date	30,140
Equity securities	14
Trading Securities, Cost	30,154	$ 39,344
Fair Value
Maturing in one year or less	1,775
Maturing after one year through five years	231
Maturing after five years through ten years	1,296
Maturing after ten years through twenty years	0
Maturing after twenty years	21,143
Total with Maturity Date	24,445
Equity securities	123
Trading Securities, Fair Value	24,568	34,134
Amortized Cost
Maturing in one year or less	13,077
Maturing after one year through five years	120,405
Maturing after five years through ten years	176,010
Maturing after ten years through twenty years	188,557
Maturing after twenty years	308,199
Total with Maturity Date	806,248
Equity securities	88
Available-for-sale Securities, Amortized Cost	806,336	1,139,740
Fair Value
Maturing in one year or less	13,063
Maturing after one year through five years	120,126
Maturing after five years through ten years	173,720
Maturing after ten years through twenty years	187,940
Maturing after twenty years	305,970
Total with Maturity Date	800,819
Equity securities	98
Fair Value	800,917	1,138,573
Amortized Cost
Maturing in one year or less	1,962
Maturing after one year through five years	18,988
Maturing after five years through ten years	113,587
Maturing after ten years through twenty years	88,546
Maturing after twenty years	44,790
Held-to-maturity Securities	267,873	220,666
Fair Value
Maturing in one year or less	1,975
Maturing after one year through five years	19,000
Maturing after five years through ten years	114,336
Maturing after ten years through twenty years	91,098
Maturing after twenty years	44,119
Held-to-maturity Securities, Fair Value	$ 270,528	$ 226,627