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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Amortized cost | $ 586,178 | $ 583,939
Gross unrealized gains | 3,842 | 3,158
Gross unrealized losses | (4,148) | (6,061)
Fair value | 585,872 | 581,036
Available-for-sale [Abstract] |  |
Amortized cost | 611,178 | 608,939
Gross unrealized gains | 3,932 | 3,234
Gross unrealized losses | (4,742) | (6,779)
Fair value | 610,368 | 605,394
Held-to-maturity [Abstract] |  |
Amortized cost | 858 | 866
Gross unrealized gains | 0 | 1
Gross unrealized losses | 0 | 0
Fair value | 858 | 867
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 236,345 | 223,014
Gross unrealized gains | 173 | 193
Gross unrealized losses | (460) | (743)
Fair value | 236,058 | 222,464
State and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 129,872 | 133,351
Gross unrealized gains | 2,833 | 1,957
Gross unrealized losses | (763) | (1,792)
Fair value | 131,942 | 133,516
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 219,961 | 227,574
Gross unrealized gains | 836 | 1,008
Gross unrealized losses | (2,925) | (3,526)
Fair value | 217,872 | 225,056
CRA Investments Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 25,000 | 25,000
Gross unrealized gains | 90 | 76
Gross unrealized losses | (594) | (718)
Fair value | 24,496 | 24,358
State and Political Subdivisions [Member] |  |
Held-to-maturity [Abstract] |  |
Amortized cost | 858 | 866
Gross unrealized gains | 0 | 1
Gross unrealized losses | 0 | 0
Fair value | $ 858 | $ 867

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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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