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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | $ 583,939 | $ 568,381
Gross unrealized gains | 3,158 | 5,582
Gross unrealized losses | (6,061) | (3,778)
Fair value | 581,036 | 570,185
Securities Available-for-Sale [Abstract] |  |
Amortized cost | 608,939 | 593,381
Gross unrealized gains | 3,234 | 5,714
Gross unrealized losses | (6,779) | (4,159)
Available-for-sale securities | 605,394 | 594,936
Securities Held-to-Maturity [Abstract] |  |
Amortized cost | 866 | 1,661
Gross unrealized gains | 1 | 2
Gross unrealized losses | 0 | (12)
Fair value | 867 | 1,651
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 223,014 | 240,434
Gross unrealized gains | 193 | 311
Gross unrealized losses | (743) | (1,351)
Fair value | 222,464 | 239,394
State and Political Subdivisions [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 133,351 | 125,665
Gross unrealized gains | 1,957 | 3,707
Gross unrealized losses | (1,792) | (157)
Fair value | 133,516 | 129,215
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 227,574 | 202,282
Gross unrealized gains | 1,008 | 1,564
Gross unrealized losses | (3,526) | (2,270)
Fair value | 225,056 | 201,576
CRA Investments Funds [Member] |  |
Available-for-sale Equity Securities [Abstract] |  |
Amortized cost | 25,000 | 25,000
Gross unrealized gains | 76 | 132
Gross unrealized losses | (718) | (381)
Fair value | 24,358 | 24,751
U.S. Treasury and Government Agencies [Member] |  |
Securities Held-to-Maturity [Abstract] |  |
Amortized cost | 0 | 480
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (12)
Fair value | 0 | 468
State and Political Subdivisions [Member] |  |
Securities Held-to-Maturity [Abstract] |  |
Amortized cost | 866 | 1,181
Gross unrealized gains | 1 | 2
Gross unrealized losses | 0 | 0
Fair value | $ 867 | $ 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=73527792&loc=d3e27161-111563 + Details
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