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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Amortized cost | $ 599,418 | $ 568,381
Gross unrealized gains | 7,777 | 5,582
Gross unrealized losses | (1,138) | (3,778)
Fair value | 606,057 | 570,185
Available-for-sale [Abstract] |  |
Amortized cost | 624,418 | 593,381
Gross unrealized gains | 8,070 | 5,714
Gross unrealized losses | (1,287) | (4,159)
Fair value | 631,201 | 594,936
Held-to-maturity [Abstract] |  |
Amortized cost | 1,181 | 1,661
Gross unrealized gains | 1 | 2
Gross unrealized losses | 0 | (12)
Fair value | 1,182 | 1,651
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 243,980 | 240,434
Gross unrealized gains | 1,311 | 311
Gross unrealized losses | (180) | (1,351)
Fair value | 245,111 | 239,394
State and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 128,644 | 125,665
Gross unrealized gains | 4,646 | 3,707
Gross unrealized losses | (115) | (157)
Fair value | 133,175 | 129,215
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 226,794 | 202,282
Gross unrealized gains | 1,820 | 1,564
Gross unrealized losses | (843) | (2,270)
Fair value | 227,771 | 201,576
CRA Investments Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 25,000 | 25,000
Gross unrealized gains | 293 | 132
Gross unrealized losses | (149) | (381)
Fair value | 25,144 | 24,751
U.S. Treasury and Government Agencies [Member] |  |
Held-to-maturity [Abstract] |  |
Amortized cost |  | 480
Gross unrealized gains |  | 0
Gross unrealized losses |  | (12)
Fair value |  | 468
State and Political Subdivisions [Member] |  |
Held-to-maturity [Abstract] |  |
Amortized cost | 1,181 | 1,181
Gross unrealized gains | 1 | 2
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=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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