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Investment Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) securities | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Available-for-sale: [Abstract] |  |  |
Amortized Cost | $ 628,895 | $ 516,829 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,037 | 5,052 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (11,084) | (3,033) |
Fair Value | 619,848 | 518,848 |
Held-to-maturity Securities [Abstract] |  |  |
Held-to-maturity Securities | 74,231 | 85,208 |
Held-to-maturity Securities, Fair Value | 73,096 | 85,737 |
Realized Investment Gains (Losses) [Abstract] |  |  |
Proceeds from sales | 70,757 | 19,380 | $ 75,618
Gross gains | 1,192 | 452 | 1,452
Gross losses | 0 | 0 | 737
Income tax expense | 465 | 176 | $ 279
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 138,819 | 90,368 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 13 | 41 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2,508) | (268) |
Fair Value | 136,324 | 90,141 |
Held-to-maturity Securities [Abstract] |  |  |
Held-to-maturity Securities | 74,231 | 85,208 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 203 | 743 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,338) | (214) |
Held-to-maturity Securities, Fair Value | 73,096 | 85,737 |
Available for Sale Securities transferred-carry value |  | 53,600 |
Available For Sale Securities Transfers To Held To Maturity Gross Losses |  | 1,400 |
Obligations of states and political subdivisions |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 164,163 | 107,164 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,346 | 3,608 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2,804) | (55) |
Fair Value | 162,705 | 110,717 |
Mortgage-backed securities: GSE residential |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 318,829 | 312,132 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 531 | 1,374 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (4,369) | (1,452) |
Fair Value | 314,991 | 312,054 |
Trust preferred securities |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 3,050 | 3,130 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1,398) | (1,224) |
Fair Value | $ 1,652 | 1,906 |
Held-to-maturity Securities [Abstract] |  |  |
Number of trust preferred securities | securities | 1 |  |
Maturities of Debt Securities | twenty-one |  |
Other securities |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | $ 4,034 | 4,035 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 147 | 29 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (5) | (34) |
Fair Value | $ 4,176 | $ 4,030 |

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