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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Amortized cost | $ 546,539 | $ 613,395
Gross unrealized gains | 7,181 | 7,358
Gross unrealized losses | (2,035) | (5,456)
Fair value | 551,685 | 615,297
Available-for-sale [Abstract] |  |
Amortized cost | 571,539 | 638,395
Gross unrealized gains | 7,209 | 7,358
Gross unrealized losses | (2,035) | (5,567)
Fair value | 576,713 | 640,186
Held-to-maturity [Abstract] |  |
Amortized cost | 1,661 | 1,662
Gross unrealized gains | 1 | 1
Gross unrealized losses | (11) | (19)
Fair value | 1,651 | 1,644
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 201,461 | 190,563
Gross unrealized gains | 990 | 509
Gross unrealized losses | (401) | (2,140)
Fair value | 202,050 | 188,932
State and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 132,249 | 133,951
Gross unrealized gains | 3,718 | 3,973
Gross unrealized losses | (508) | (466)
Fair value | 135,459 | 137,458
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 212,829 | 288,881
Gross unrealized gains | 2,473 | 2,876
Gross unrealized losses | (1,126) | (2,850)
Fair value | 214,176 | 288,907
CRA Investments Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 25,000 | 25,000
Gross unrealized gains | 28 | 0
Gross unrealized losses | 0 | (111)
Fair value | 25,028 | 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 | (11) | (19)
Fair value | 469 | 461
State and Political Subdivisions [Member] |  |
Held-to-maturity [Abstract] |  |
Amortized cost | 1,181 | 1,182
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | 0
Fair value | $ 1,182 | $ 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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