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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 260,077 | $ 256,567 | $ 244,123
Unrealized Gains | 1,678 | 4,499 | 4,393
Unrealized Losses | (5,439) | (1,411) | (2,278)
Fair Value (Estimated) | 256,316 | 259,655 | 246,238
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 11,155 | 11,155 | 11,152
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | (584) | (180) | (181)
Fair Value (Estimated) | 10,571 | 10,975 | 10,971
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 20,585 | 23,284 | 27,224
Unrealized Gains | 404 | 568 | 820
Unrealized Losses | (365) | (128) | (41)
Fair Value (Estimated) | 20,624 | 23,724 | 28,003
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 224,037 | 217,828 | 201,447
Unrealized Gains | 1,274 | 3,931 | 3,573
Unrealized Losses | (4,490) | (1,103) | (2,056)
Fair Value (Estimated) | 220,821 | 220,656 | 202,964
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 4,300 | 4,300 | 4,300
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 4,300 | $ 4,300 | $ 4,300

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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