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Investment Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) securities | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | $ 546,247 |  | $ 546,247 |  | $ 516,829
Gross Unrealized Gains | 11,994 |  | 11,994 |  | 5,052
Gross Unrealized (Losses) | (1,615) |  | (1,615) |  | (3,033)
Fair Value | 556,626 |  | 556,626 |  | 518,848
Gain (Loss) on Sale of Securities, Net | 466 | $ 1 | 1,130 | $ 231 |
Held-to-maturity: [Abstract] |  |  |  |  |
Held-to-maturity Securities | 101,679 |  | 101,679 |  | 85,208
Held-to-maturity Securities, Fair Value | 102,648 |  | 102,648 |  | 85,737
Realized Investment Gains (Losses) [Abstract] |  |  |  |  |
Gross gains | 466 | 1 | 1,130 | 231 |
Gross losses | 0 | $ 0 |  | $ 0 |
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 48,546 |  | 48,546 |  | 90,368
Gross Unrealized Gains | 190 |  | 190 |  | 41
Gross Unrealized (Losses) | 0 |  | 0 |  | (268)
Fair Value | 48,736 |  | 48,736 |  | 90,141
Held-to-maturity: [Abstract] |  |  |  |  |
Held-to-maturity Securities | 101,679 |  | 101,679 |  | 85,208
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,033 |  | 1,033 |  | 743
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (64) |  | (64) |  | (214)
Held-to-maturity Securities, Fair Value | 102,648 |  | 102,648 |  | 85,737
Obligations of states and political subdivisions |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 155,715 |  | 155,715 |  | 107,164
Gross Unrealized Gains | 5,297 |  | 5,297 |  | 3,608
Gross Unrealized (Losses) | (93) |  | (93) |  | (55)
Fair Value | 160,919 |  | 160,919 |  | 110,717
Mortgage-backed securities: GSE residential |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 334,872 |  | 334,872 |  | 312,132
Gross Unrealized Gains | 6,420 |  | 6,420 |  | 1,374
Gross Unrealized (Losses) | (102) |  | (102) |  | (1,452)
Fair Value | 341,190 |  | 341,190 |  | 312,054
Trust preferred securities |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 3,075 |  | 3,075 |  | 3,130
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized (Losses) | (1,414) |  | (1,414) |  | (1,224)
Fair Value | 1,661 |  | $ 1,661 |  | 1,906
Number of trust preferred securities | securities |  |  | 1 |  |
Trust preferred securities | Maximum [Member] |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Maturities of Debt Securities |  |  | twenty-one years |  |
Other securities |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 4,039 |  | $ 4,039 |  | 4,035
Gross Unrealized Gains | 87 |  | 87 |  | 29
Gross Unrealized (Losses) | (6) |  | (6) |  | (34)
Fair Value | $ 4,120 |  | $ 4,120 |  | $ 4,030

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