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Investment Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) securities | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | $ 617,619 |  | $ 617,619 |  | $ 628,895
Gross Unrealized Gains | 6,378 |  | 6,378 |  | 2,037
Gross Unrealized (Losses) | (2,793) |  | (2,793) |  | (11,084)
Fair Value | 621,204 |  | 621,204 |  | 619,848
Gain (Loss) on Sale of Securities, Net | 254 | $ 466 | 589 | $ 1,130 |
Held-to-maturity: [Abstract] |  |  |  |  |
Held-to-maturity Securities | 69,306 |  | 69,306 |  | 74,231
Held-to-maturity Securities, Fair Value | 69,137 |  | 69,137 |  | 73,096
Realized Investment Gains (Losses) [Abstract] |  |  |  |  |
Gross gains | 394 | 446 | 746 | 1,130 |
Gross losses | (140) | $ 0 | (157) | $ 0 |
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 126,931 |  | 126,931 |  | 138,819
Gross Unrealized Gains | 484 |  | 484 |  | 13
Gross Unrealized (Losses) | (1,014) |  | (1,014) |  | (2,508)
Fair Value | 126,401 |  | 126,401 |  | 136,324
Held-to-maturity: [Abstract] |  |  |  |  |
Held-to-maturity Securities | 69,306 |  | 69,306 |  | 74,231
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 328 |  | 328 |  | 203
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (497) |  | (497) |  | (1,338)
Held-to-maturity Securities, Fair Value | 69,137 |  | 69,137 |  | 73,096
Obligations of states and political subdivisions |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 169,526 |  | 169,526 |  | 164,163
Gross Unrealized Gains | 3,486 |  | 3,486 |  | 1,346
Gross Unrealized (Losses) | (486) |  | (486) |  | (2,804)
Fair Value | 172,526 |  | 172,526 |  | 162,705
Mortgage-backed securities: GSE residential |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 314,195 |  | 314,195 |  | 318,829
Gross Unrealized Gains | 2,223 |  | 2,223 |  | 531
Gross Unrealized (Losses) | (1,061) |  | (1,061) |  | (4,369)
Fair Value | 315,357 |  | 315,357 |  | 314,991
Trust preferred securities |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 2,933 |  | 2,933 |  | 3,050
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized (Losses) | (232) |  | (232) |  | (1,398)
Fair Value | 2,701 |  | $ 2,701 |  | 1,652
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 | 4,034 |  | $ 4,034 |  | 4,034
Gross Unrealized Gains | 185 |  | 185 |  | 147
Gross Unrealized (Losses) | 0 |  | 0 |  | (5)
Fair Value | $ 4,219 |  | $ 4,219 |  | $ 4,176

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