Securities (Details) - Securities In An Unrealized Loss Position $ in Thousands	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($) security
Collateralized Mortgage Obligations
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities (securities) | security	74	87
Fair Value - Less Than 12 Months	$ 82,431	$ 61,321
Unrealized Losses - Less Than 12 Months	778	559
Fair Value - 12 Months or Longer	233,676	284,327
Unrealized Losses - 12 Months or Longer	5,332	6,423
Fair Value - Total	316,107	345,648
Unrealized Losses - Total	$ 6,110	$ 6,982
Other Mortgage Backed Securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities (securities) | security	20	11
Fair Value - Less Than 12 Months	$ 56,341	$ 1,113
Unrealized Losses - Less Than 12 Months	316	1
Fair Value - 12 Months or Longer	34,405	39,043
Unrealized Losses - 12 Months or Longer	475	309
Fair Value - Total	90,746	40,156
Unrealized Losses - Total	$ 791	$ 310
Municipal Securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities (securities) | security	155	91
Fair Value - Less Than 12 Months	$ 21,714	$ 1,317
Unrealized Losses - Less Than 12 Months	328	9
Fair Value - 12 Months or Longer	56,520	53,987
Unrealized Losses - 12 Months or Longer	1,384	1,009
Fair Value - Total	78,234	55,304
Unrealized Losses - Total	$ 1,712	$ 1,018
Trust-preferred collateralized debt obligations
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities (securities) | security	7	4
Fair Value - Less Than 12 Months	$ 1,077	$ 0
Unrealized Losses - Less Than 12 Months	170	0
Fair Value - 12 Months or Longer	28,413	22,791
Unrealized Losses - 12 Months or Longer	16,134	14,880
Fair Value - Total	29,490	22,791
Unrealized Losses - Total	$ 16,304	$ 14,880
Equity Securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities (securities) | security	1	1
Fair Value - Less Than 12 Months	$ 0	$ 0
Unrealized Losses - Less Than 12 Months	0	0
Fair Value - 12 Months or Longer	2,286	2,270
Unrealized Losses - 12 Months or Longer	44	35
Fair Value - Total	2,286	2,270
Unrealized Losses - Total	$ 44	$ 35
Unrealized Loss Position
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities (securities) | security	257	195
Fair Value - Less Than 12 Months	$ 161,563	$ 65,694
Unrealized Losses - Less Than 12 Months	1,592	579
Fair Value - 12 Months or Longer	355,300	402,418
Unrealized Losses - 12 Months or Longer	23,369	22,656
Fair Value - Total	516,863	468,112
Unrealized Losses - Total	$ 24,961	$ 23,235
U.S. Agency Securities
Securities (Details) - Securities In An Unrealized Loss Position [Line Items]
Number of Securities (securities) | security		1
Fair Value - Less Than 12 Months		$ 1,943
Unrealized Losses - Less Than 12 Months		10
Fair Value - 12 Months or Longer		0
Unrealized Losses - 12 Months or Longer		0
Fair Value - Total		1,943
Unrealized Losses - Total		$ 10