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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 597,020 | $ 565,199
Gross unrealized gains | 1,098 | 2,544
Gross unrealized losses | (12,354) | (6,340)
Fair value | 585,764 | 561,403
Equity Securities, Available-for-sale [Abstract] |  |
Amortized cost |  | 25,000
Available-for-sale [Abstract] |  |
Amortized cost | 597,020 | 590,199
Gross unrealized gains | 1,098 | 2,620
Gross unrealized losses | (12,354) | (7,058)
Available-for-sale securities | 585,764 | 585,761
U.S. Treasury and Government Agencies [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 249,625 | 211,574
Gross unrealized gains | 29 | 170
Gross unrealized losses | (2,881) | (1,172)
Fair value | 246,773 | 210,572
State and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 129,628 | 144,159
Gross unrealized gains | 875 | 2,017
Gross unrealized losses | (3,014) | (1,161)
Fair value | 127,489 | 145,015
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 217,260 | 208,959
Gross unrealized gains | 194 | 357
Gross unrealized losses | (6,454) | (4,007)
Fair value | 211,000 | 205,309
Other Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 507 | 507
Gross unrealized gains | 0 | 0
Gross unrealized losses | (5) | 0
Fair value | 502 | 507
CRA Investments Funds [Member] |  |
Equity Securities, Available-for-sale [Abstract] |  |
Amortized cost | 0 | 25,000
Gross unrealized gains | 0 | 76
Gross unrealized losses | 0 | (718)
Fair value | $ 0 | $ 24,358

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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