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Investment Securities (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) securities | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Available-for-sale: [Abstract] |  |  |
Amortized Cost | $ 581,607 |  | $ 581,543
Gross Unrealized Gains | 1,259 |  | 2,900
Gross Unrealized (Losses) | (13,004) |  | (5,864)
Fair Value | 569,862 |  | 578,579
Gain (Loss) on Sale of Securities, Net | 20 | $ 0 |
Held-to-maturity: [Abstract] |  |  |
Held-to-maturity Securities | 69,358 |  | 69,332
Held-to-maturity Securities, Fair Value | 67,631 |  | 68,457
Realized Investment Gains (Losses) [Abstract] |  |  |
Gross gains | 20 | 0 |
Gross losses | 0 | $ 0 |
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 124,819 |  | 115,796
Gross Unrealized Gains | 0 |  | 8
Gross Unrealized (Losses) | (3,734) |  | (2,034)
Fair Value | 121,085 |  | 113,770
Held-to-maturity: [Abstract] |  |  |
Held-to-maturity Securities | 69,358 |  | 69,332
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 8 |  | 103
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,735) |  | (978)
Held-to-maturity Securities, Fair Value | 67,631 |  | 68,457
Obligations of states and political subdivisions |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 161,424 |  | 165,037
Gross Unrealized Gains | 1,029 |  | 2,254
Gross Unrealized (Losses) | (2,228) |  | (1,025)
Fair Value | 160,225 |  | 166,266
Mortgage-backed securities: GSE residential |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 290,477 |  | 295,778
Gross Unrealized Gains | 75 |  | 493
Gross Unrealized (Losses) | (6,715) |  | (2,460)
Fair Value | 283,837 |  | 293,811
Trust preferred securities |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 2,849 |  | 2,893
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized (Losses) | (327) |  | (345)
Fair Value | $ 2,522 |  | 2,548
Number of trust preferred securities | securities | 1 |  |
Trust preferred securities | Maximum [Member] |  |  |
Available-for-sale: [Abstract] |  |  |
Maturities of Debt Securities | twenty years |  |
Other securities |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | $ 2,038 |  | 2,039
Gross Unrealized Gains | 155 |  | 145
Gross Unrealized (Losses) | 0 |  | 0
Fair Value | $ 2,193 |  | $ 2,184

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