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Investment Securities (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | $ 723,348,000 |  | $ 723,348,000 |  | $ 701,225,000
Gross Unrealized Gains | 13,760,000 |  | 13,760,000 |  | 2,310,000
Gross Unrealized (Losses) | (410,000) |  | (410,000) |  | (11,261,000)
Fair Value | 736,698,000 |  | 736,698,000 |  | 692,274,000
Debt and Equity Securities, Gain (Loss) | 51,000 | $ 0 | 323,000 | $ 901,000 |
Held-to-maturity: [Abstract] |  |  |  |  |
Debt Securities, Held-to-maturity | 69,515,000 |  | 69,515,000 |  | 69,436,000
Debt Securities, Held-to-maturity, Fair Value | 69,492,000 |  | 69,492,000 |  | 67,909,000
Realized Investment Gains (Losses) [Abstract] |  |  |  |  |
Gross gains | 51,000 | 0 | 365,000 | 941,000 |
Gross losses | 0 | $ 0 | (42,000) | $ (40,000) |
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 165,765,000 |  | 165,765,000 |  | 201,380,000
Gross Unrealized Gains | 1,481,000 |  | 1,481,000 |  | 504,000
Gross Unrealized (Losses) | (144,000) |  | (144,000) |  | (3,235,000)
Fair Value | 167,102,000 |  | 167,102,000 |  | 198,649,000
Held-to-maturity: [Abstract] |  |  |  |  |
Debt Securities, Held-to-maturity | 69,515,000 |  | 69,515,000 |  | 69,436,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 104,000 |  | 104,000 |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (127,000) |  | (127,000) |  | (1,527,000)
Debt Securities, Held-to-maturity, Fair Value | 69,492,000 |  | 69,492,000 |  | 67,909,000
Obligations of states and political subdivisions |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 181,038,000 |  | 181,038,000 |  | 193,195,000
Gross Unrealized Gains | 6,303,000 |  | 6,303,000 |  | 1,224,000
Gross Unrealized (Losses) | (11,000) |  | (11,000) |  | (1,840,000)
Fair Value | 187,330,000 |  | 187,330,000 |  | 192,579,000
Mortgage-backed securities: GSE residential |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 373,267,000 |  | 373,267,000 |  | 304,372,000
Gross Unrealized Gains | 5,832,000 |  | 5,832,000 |  | 486,000
Gross Unrealized (Losses) | (255,000) |  | (255,000) |  | (6,186,000)
Fair Value | 378,844,000 |  | 378,844,000 |  | 298,672,000
Trust preferred securities |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Debt and Equity Securities, Gain (Loss) | 846,000 |  |  |  |
Other securities |  |  |  |  |
Available-for-sale: [Abstract] |  |  |  |  |
Amortized Cost | 3,278,000 |  | 3,278,000 |  | 2,278,000
Gross Unrealized Gains | 144,000 |  | 144,000 |  | 96,000
Gross Unrealized (Losses) | 0 |  | 0 |  | 0
Fair Value | $ 3,422,000 |  | $ 3,422,000 |  | $ 2,374,000

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