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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | $ 565,199 | $ 583,939
Gross unrealized gains | 2,544 | 3,158
Gross unrealized losses | (6,340) | (6,061)
Fair value | 561,403 | 581,036
Available-for-sale Equity Securities [Abstract] |  |
Amortized cost | 25,000 |
Securities Available-for-Sale [Abstract] |  |
Amortized cost | 590,199 | 608,939
Gross unrealized gains | 2,620 | 3,234
Gross unrealized losses | (7,058) | (6,779)
Available-for-sale securities | 585,761 | 605,394
Securities Held-to-Maturity [Abstract] |  |
Amortized cost | 659 | 866
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | 0
Fair value | 660 | 867
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 211,574 | 223,014
Gross unrealized gains | 170 | 193
Gross unrealized losses | (1,172) | (743)
Fair value | 210,572 | 222,464
State and Political Subdivisions [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 144,159 | 133,351
Gross unrealized gains | 2,017 | 1,957
Gross unrealized losses | (1,161) | (1,792)
Fair value | 145,015 | 133,516
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 208,959 | 227,574
Gross unrealized gains | 357 | 1,008
Gross unrealized losses | (4,007) | (3,526)
Fair value | 205,309 | 225,056
Other Debt Securities [Member] |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized cost | 507 | 0
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 507 | 0
CRA Investments Funds [Member] |  |
Available-for-sale Equity Securities [Abstract] |  |
Amortized cost | 25,000 | 25,000
Gross unrealized gains | 76 | 76
Gross unrealized losses | (718) | (718)
Fair value | 24,358 | 24,358
State and Political Subdivisions [Member] |  |
Securities Held-to-Maturity [Abstract] |  |
Amortized cost | 659 | 866
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | 0
Fair value | $ 660 | $ 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=82897076&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=82897076&loc=d3e27161-111563 + Details
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