Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value
Less than 12 months	$ 443,830	$ 301,140
12 months or longer	254,229	226,642
Total	698,059	527,782
Unrealized Losses
Less than 12 months	(6,030)	(3,672)
12 months or longer	(6,673)	(6,354)
Total	(12,703)	(10,026)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	101,601	100,714
12 months or longer	60,922	24,511
Total	162,523	125,225
Unrealized Losses
Less than 12 months	(1,642)	(1,769)
12 months or longer	(1,612)	(403)
Total	(3,254)	(2,172)
U.S. Treasury securities and obligations of U.S. Government Sponsored Entities [Member]
Fair Value
Less than 12 months		100
12 months or longer		0
Total		100
Unrealized Losses
Less than 12 months		0
12 months or longer		0
Total		0
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Fair Value
Less than 12 months	112,236	36,890
12 months or longer	14,508	21,640
Total	126,744	58,530
Unrealized Losses
Less than 12 months	(1,082)	(153)
12 months or longer	(256)	(271)
Total	(1,338)	(424)
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Fair Value
Less than 12 months	97,512	100,148
12 months or longer	147,266	170,400
Total	244,778	270,548
Unrealized Losses
Less than 12 months	(973)	(833)
12 months or longer	(4,333)	(5,523)
Total	(5,306)	(6,356)
Private mortage backed securities [Member]
Fair Value
Less than 12 months	31,792
12 months or longer	0
Total	31,792
Unrealized Losses
Less than 12 months	(766)
12 months or longer	0
Total	(766)
Private collaterlized mortgage obligations [Member]
Fair Value
Less than 12 months	19,939	61,554
12 months or longer	31,533	10,091
Total	51,472	71,645
Unrealized Losses
Less than 12 months	(321)	(914)
12 months or longer	(472)	(157)
Total	(793)	(1,071)
Obligations of state and political subdivisions [Member]
Fair Value
Less than 12 months	11,570	1,734
12 months or longer	0	0
Total	11,570	1,734
Unrealized Losses
Less than 12 months	(110)	(3)
12 months or longer	0	0
Total	(110)	$ (3)
Corporate and other debt securities [member]
Fair Value
Less than 12 months	31,342
12 months or longer	0
Total	31,342
Unrealized Losses
Less than 12 months	(416)
12 months or longer	0
Total	(416)
Private commercial mortgage backed securities [Member]
Fair Value
Less than 12 months	37,838
12 months or longer	0
Total	37,838
Unrealized Losses
Less than 12 months	(720)
12 months or longer	0
Total	$ (720)