Securities - AFS and HTM, Amortized Cost and FV (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available for sale
Amortized Cost	$ 670,003	$ 924,755
Gross Unrealized Gains	9,019	11,542
Gross Unrealized Losses	(5,316)	(10,762)
Fair Value	673,706	925,535
Held to maturity
Amortized cost	332,022	118,209
Unrealized Gains	953	575
Unrealized Losses	(1,507)	(439)
Held to maturity, fair value	331,468	118,345
U.S. Treasury securities
Available for sale
Amortized Cost	44,430	19,382
Gross Unrealized Gains	206	264
Gross Unrealized Losses	(33)	(33)
Fair Value	44,603	19,613
Held to maturity
Amortized cost	25,146	25,008
Unrealized Losses	(30)	(6)
Held to maturity, fair value	25,116	25,002
Bonds
Available for sale
Amortized Cost	297,448	522,008
Gross Unrealized Gains	1,135	1,749
Gross Unrealized Losses	(1,947)	(7,516)
Fair Value	296,636	516,241
Held to maturity
Amortized cost	69,379
Unrealized Gains	145
Unrealized Losses	(372)
Held to maturity, fair value	69,152
Residential mortgage-backed securities
Available for sale
Amortized Cost	34,864	40,171
Gross Unrealized Gains	1,008	1,672
Gross Unrealized Losses	(19)
Fair Value	35,853	41,843
Held to maturity
Amortized cost	23,735	29,782
Unrealized Gains	311	528
Held to maturity, fair value	24,046	30,310
Commercial mortgage-backed securities
Available for sale
Amortized Cost	9,174	11,192
Gross Unrealized Gains	35
Gross Unrealized Losses	(2)	(137)
Fair Value	9,207	11,055
Held to maturity
Amortized cost	18,658
Unrealized Gains	27
Unrealized Losses	(92)
Held to maturity, fair value	18,593
Collateralized mortgage obligations
Available for sale
Amortized Cost	54,297	89,291
Gross Unrealized Gains	48	133
Gross Unrealized Losses	(1,644)	(2,300)
Fair Value	52,701	87,124
Held to maturity
Amortized cost	167,541	57,328
Unrealized Gains	302
Unrealized Losses	(970)	(430)
Held to maturity, fair value	166,873	56,898
Corporate securities
Available for sale
Amortized Cost	94,877	93,406
Gross Unrealized Gains	3,399	5,125
Gross Unrealized Losses	(326)	(59)
Fair Value	97,950	98,472
States and political subdivisions
Available for sale
Amortized Cost	116,246	135,419
Gross Unrealized Gains	2,581	2,083
Gross Unrealized Losses	(102)	(717)
Fair Value	118,725	136,785
Held to maturity
Amortized cost	27,563	6,091
Unrealized Gains	168	47
Unrealized Losses	(43)	(3)
Held to maturity, fair value	27,688	6,135
Commercial mortgage backed securities
Available for sale
Amortized Cost	498	593
Gross Unrealized Gains	33	47
Fair Value	531	640
Equity securities
Available for sale
Amortized Cost	18,169	13,293
Gross Unrealized Gains	574	469
Gross Unrealized Losses	(1,243)
Fair Value	$ 17,500	$ 13,762

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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