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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Amortized cost | $ 554,513 | $ 613,395
Gross unrealized gains | 6,029 | 7,358
Gross unrealized losses | (4,103) | (5,456)
Fair value | 556,439 | 615,297
Available-for-sale [Abstract] |  |
Amortized cost | 579,513 | 638,395
Gross unrealized gains | 6,029 | 7,358
Gross unrealized losses | (4,306) | (5,567)
Fair value | 581,236 | 640,186
Held-to-maturity [Abstract] |  |
Amortized cost | 1,661 | 1,662
Gross unrealized gains | 2 | 1
Gross unrealized losses | (22) | (19)
Fair value | 1,641 | 1,644
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 182,465 | 190,563
Gross unrealized gains | 587 | 509
Gross unrealized losses | (1,338) | (2,140)
Fair value | 181,714 | 188,932
State and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 133,031 | 133,951
Gross unrealized gains | 2,913 | 3,973
Gross unrealized losses | (783) | (466)
Fair value | 135,161 | 137,458
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 239,017 | 288,881
Gross unrealized gains | 2,529 | 2,876
Gross unrealized losses | (1,982) | (2,850)
Fair value | 239,564 | 288,907
CRA Investments Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 25,000 | 25,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | (203) | (111)
Fair value | 24,797 | 24,889
U.S. Treasury and Government Agencies [Member] |  |
Held-to-maturity [Abstract] |  |
Amortized cost | 480 | 480
Gross unrealized gains | 0 | 0
Gross unrealized losses | (22) | (19)
Fair value | 458 | 461
State and Political Subdivisions [Member] |  |
Held-to-maturity [Abstract] |  |
Amortized cost | 1,181 | 1,182
Gross unrealized gains | 2 | 1
Gross unrealized losses | 0 | 0
Fair value | $ 1,183 | $ 1,183

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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