Securities (Details) - Securities In An Unrealized Loss Position $ in Thousands	Sep. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	156	252
Fair Value - Less Than 12 Months	$ 279,913	$ 428,035
Unrealized Losses - Less Than 12 Months	1,209	4,897
Fair Value - 12 Months or Longer	162,590	337,516
Unrealized Losses - 12 Months or Longer	17,640	22,534
Fair Value - Total	442,503	765,551
Unrealized Losses - Total	$ 18,849	$ 27,431
U.S. treasury securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	5	4
Fair Value - Less Than 12 Months	$ 10,049	$ 7,946
Unrealized Losses - Less Than 12 Months	7	35
Fair Value - 12 Months or Longer	1,999	0
Unrealized Losses - 12 Months or Longer	1	0
Fair Value - Total	12,048	7,946
Unrealized Losses - Total	$ 8	$ 35
U.S. agency securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	12	10
Fair Value - Less Than 12 Months	$ 23,394	$ 30,620
Unrealized Losses - Less Than 12 Months	49	169
Fair Value - 12 Months or Longer	0	0
Unrealized Losses - 12 Months or Longer	0	0
Fair Value - Total	23,394	30,620
Unrealized Losses - Total	$ 49	$ 169
CMOs
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	64	133
Fair Value - Less Than 12 Months	$ 180,572	$ 309,787
Unrealized Losses - Less Than 12 Months	717	3,110
Fair Value - 12 Months or Longer	119,934	257,362
Unrealized Losses - 12 Months or Longer	1,519	5,975
Fair Value - Total	300,506	567,149
Unrealized Losses - Total	$ 2,236	$ 9,085
MBSs
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	15	27
Fair Value - Less Than 12 Months	$ 45,686	$ 63,028
Unrealized Losses - Less Than 12 Months	89	427
Fair Value - 12 Months or Longer	6,573	31,980
Unrealized Losses - 12 Months or Longer	32	444
Fair Value - Total	52,259	95,008
Unrealized Losses - Total	$ 121	$ 871
Municipal securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	49	68
Fair Value - Less Than 12 Months	$ 18,615	$ 8,135
Unrealized Losses - Less Than 12 Months	112	65
Fair Value - 12 Months or Longer	2,307	24,227
Unrealized Losses - 12 Months or Longer	18	245
Fair Value - Total	20,922	32,362
Unrealized Losses - Total	$ 130	$ 310
CDOs
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	9	8
Fair Value - Less Than 12 Months	$ 1,218	$ 8,034
Unrealized Losses - Less Than 12 Months	9	971
Fair Value - 12 Months or Longer	29,398	21,642
Unrealized Losses - 12 Months or Longer	16,058	15,821
Fair Value - Total	30,616	29,676
Unrealized Losses - Total	$ 16,067	$ 16,792
Equity securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities | security	2	2
Fair Value - Less Than 12 Months	$ 379	$ 485
Unrealized Losses - Less Than 12 Months	226	120
Fair Value - 12 Months or Longer	2,379	2,305
Unrealized Losses - 12 Months or Longer	12	49
Fair Value - Total	2,758	2,790
Unrealized Losses - Total	$ 238	$ 169
Municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Number of Securities | security	16	19
Fair Value - Less Than 12 Months	$ 18,110	$ 20,054
Unrealized Loss - Less Than 12 Months	2,227	3,098
Fair Value - 12 Months or Longer	0	0
Unrealized Losses - 12 Months or Longer	0	0
Fair Value - Total	18,110	20,054
Unrealized Losses - Total	$ 2,227	$ 3,098