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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |
Amortized cost | $ 614,333 | $ 565,199
Gross unrealized gains | 1,466 | 2,544
Gross unrealized losses | (10,909) | (6,340)
Fair value | 604,890 | 561,403
Available-for-sale equity securities [Abstract] |  |
Amortized cost |  | 25,000
Available-for-sale [Abstract] |  |
Amortized cost | 614,333 | 590,199
Gross unrealized gains | 1,466 | 2,620
Gross unrealized losses | (10,909) | (7,058)
Securities available-for-sale at fair value (amortized cost of $590,199 and $608,939, respectively) | 604,890 | 585,761
Held-to-maturity [Abstract] |  |
Amortized cost | 659 | 659
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | 0
Fair value | 660 | 660
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 252,203 | 211,574
Gross unrealized gains | 200 | 170
Gross unrealized losses | (2,358) | (1,172)
Fair value | 250,045 | 210,572
State and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 134,764 | 144,159
Gross unrealized gains | 985 | 2,017
Gross unrealized losses | (2,754) | (1,161)
Fair value | 132,995 | 145,015
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 226,859 | 208,959
Gross unrealized gains | 281 | 357
Gross unrealized losses | (5,797) | (4,007)
Fair value | 221,343 | 205,309
Other Debt Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 507 | 507
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 507 | 507
CRA Investments Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 0 | 25,000
Gross unrealized gains | 0 | 76
Gross unrealized losses | 0 | (718)
Fair value | 0 | 24,358
State and Political Subdivisions [Member] |  |
Held-to-maturity [Abstract] |  |
Amortized cost | 659 | 659
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | 0
Fair value | $ 660 | $ 660

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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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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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