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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | $ 568,381 | $ 613,395
Gross unrealized gains | 5,582 | 7,358
Gross unrealized losses | (3,778) | (5,456)
Fair value | 570,185 | 615,297
Securities Available-for-Sale [Abstract] |  |
Amortized cost | 593,381 | 638,395
Gross unrealized gains | 5,582 | 7,358
Gross unrealized losses | (4,027) | (5,567)
Fair value | 594,936 | 640,186
Securities Held-to-Maturity [Abstract] |  |
Amortized cost | 1,661 | 1,662
Gross unrealized gains | 2 | 1
Gross unrealized losses | (12) | (19)
Fair value | 1,651 | 1,644
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 240,434 | 190,563
Gross unrealized gains | 311 | 509
Gross unrealized losses | (1,351) | (2,140)
Fair value | 239,394 | 188,932
State and Political Subdivisions [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 125,665 | 133,951
Gross unrealized gains | 3,707 | 3,973
Gross unrealized losses | (157) | (466)
Fair value | 129,215 | 137,458
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 202,282 | 288,881
Gross unrealized gains | 1,564 | 2,876
Gross unrealized losses | (2,270) | (2,850)
Fair value | 201,576 | 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 | (249) | (111)
Fair value | 24,751 | 24,889
U.S. Treasury and Government Agencies [Member] |  |
Securities Held-to-Maturity [Abstract] |  |
Amortized cost | 480 | 480
Gross unrealized gains | 0 | 0
Gross unrealized losses | (12) | (19)
Fair value | 468 | 461
State and Political Subdivisions [Member] |  |
Securities 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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