Securities (Details) - Securities In An Unrealized Loss Position $ in Thousands	Jun. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Securities Available-for-Sale
Number of Securities | security	71	252
Fair Value - Less Than 12 Months	$ 66,148	$ 428,035
Unrealized Losses - Less Than 12 Months	510	4,897
Fair Value - 12 Months or Longer	127,919	337,516
Unrealized Losses - 12 Months or Longer	18,704	22,534
Fair Value - Total	194,067	765,551
Unrealized Losses - Total	$ 19,214	$ 27,431
Securities Held-To-Maturity
Number of Securities | security	16	19
Fair Value - Less Than 12 Months	$ 18,394	$ 20,054
Unrealized Loss - Less Than 12 Months	2,278	3,098
Fair Value - 12 Months or Longer	0	0
Unrealized Losses - 12 Months or Longer	0	0
Fair Value - Total	18,394	20,054
Unrealized Losses - Total	$ 2,278	$ 3,098
U.S. treasury securities
Securities Available-for-Sale
Number of Securities | security		4
Fair Value - Less Than 12 Months		$ 7,946
Unrealized Losses - Less Than 12 Months		35
Fair Value - 12 Months or Longer		0
Unrealized Losses - 12 Months or Longer		0
Fair Value - Total		7,946
Unrealized Losses - Total		$ 35
U.S. agency securities
Securities Available-for-Sale
Number of Securities | security	8	10
Fair Value - Less Than 12 Months	$ 17,500	$ 30,620
Unrealized Losses - Less Than 12 Months	84	169
Fair Value - 12 Months or Longer	0	0
Unrealized Losses - 12 Months or Longer	0	0
Fair Value - Total	17,500	30,620
Unrealized Losses - Total	$ 84	$ 169
Collateralized mortgage obligations (CMOs)
Securities Available-for-Sale
Number of Securities | security	31	133
Fair Value - Less Than 12 Months	$ 24,763	$ 309,787
Unrealized Losses - Less Than 12 Months	113	3,110
Fair Value - 12 Months or Longer	89,507	257,362
Unrealized Losses - 12 Months or Longer	941	5,975
Fair Value - Total	114,270	567,149
Unrealized Losses - Total	$ 1,054	$ 9,085
Other mortgage backed securities (MBSs)
Securities Available-for-Sale
Number of Securities | security	10	27
Fair Value - Less Than 12 Months	$ 18,479	$ 63,028
Unrealized Losses - Less Than 12 Months	79	427
Fair Value - 12 Months or Longer	6,965	31,980
Unrealized Losses - 12 Months or Longer	27	444
Fair Value - Total	25,444	95,008
Unrealized Losses - Total	$ 106	$ 871
Municipal securities
Securities Available-for-Sale
Number of Securities | security	10	68
Fair Value - Less Than 12 Months	$ 3,171	$ 8,135
Unrealized Losses - Less Than 12 Months	18	65
Fair Value - 12 Months or Longer	1,012	24,227
Unrealized Losses - 12 Months or Longer	11	245
Fair Value - Total	4,183	32,362
Unrealized Losses - Total	$ 29	$ 310
Trust-preferred collateralized debt obligations (CDOs)
Securities Available-for-Sale
Number of Securities | security	10	8
Fair Value - Less Than 12 Months	$ 1,750	$ 8,034
Unrealized Losses - Less Than 12 Months	96	971
Fair Value - 12 Months or Longer	28,058	21,642
Unrealized Losses - 12 Months or Longer	17,724	15,821
Fair Value - Total	29,808	29,676
Unrealized Losses - Total	$ 17,820	$ 16,792
Equity securities
Securities Available-for-Sale
Number of Securities | security	2	2
Fair Value - Less Than 12 Months	$ 485	$ 485
Unrealized Losses - Less Than 12 Months	120	120
Fair Value - 12 Months or Longer	2,377	2,305
Unrealized Losses - 12 Months or Longer	1	49
Fair Value - Total	2,862	2,790
Unrealized Losses - Total	$ 121	$ 169