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Investment Securities, Part II (Details) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2018 USD ($) securities | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) securities | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) securities
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |  |  |
One year or less | $ 102,190,000 |  | $ 102,190,000 |  |
After 1 through 5 years | 221,842,000 |  | 221,842,000 |  |
After 5 through 10 years | 256,623,000 |  | 256,623,000 |  |
After ten years | 35,648,000 |  | 35,648,000 |  |
Fair Value | 616,303,000 |  | $ 616,303,000 |  | $ 578,579,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths) |  |  | 2.35% |  |
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths) |  |  | 2.68% |  |
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths) |  |  | 2.92% |  |
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths) |  |  | 3.40% |  |
Available-for-sale , Weighted Average Yield, Maturities (in hundredths) |  |  | 2.77% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths) |  |  | 2.52% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths) |  |  | 3.05% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths) |  |  | 3.28% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths) |  |  | 3.43% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths) |  |  | 3.08% |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |  |  |
Held-to-maturity Securities | 69,383,000 |  | $ 69,383,000 |  | 69,332,000
Held To Maturity Weighted Average Yield Maturities Year One |  |  | 1.76% |  |
Held To Maturity Weighted Average Yield Maturities After 1 Through 5 Years |  |  | 2.08% |  |
Held To Maturity Weighted Average Yield Maturities After 5 Through 10 Years |  |  | 0.00% |  |
Held To Maturity Weighted Average Yield Maturities After 10 Years |  |  | 0.00% |  |
Held To Maturity Weighted Average Yield Maturities |  |  | 2.68% |  |
Held To Maturity Tax Equivalent Yield Maturities Year One |  |  | 1.76% |  |
Held To Maturity Tax Equivalent Yield Maturities After 1 Through 5 Years |  |  | 2.08% |  |
Held To Maturity Tax Equivalent Yield Maturities After 5 Through 10 Years |  |  | 0.00% |  |
Held To Maturity Tax Equivalent Yield Maturities After 10 Years |  |  | 0.00% |  |
Held To Maturity Tax Equivalent Yield Maturities |  |  | 2.68% |  |
Tax rate used to calculate tax-equivalent yields (in hundredths) |  |  | 21.00% |  |
Percentage investment book value exceeds total stockholders' equity (in hundredths) |  |  | 10.00% |  |
Investment Securities Pledged as Collateral | 492,000,000 |  | $ 492,000,000 |  | 479,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 358,734,000 |  | 358,734,000 |  | 289,151,000
Less than 12 months, Unrealized Losses | (7,954,000) |  | (7,954,000) |  | (3,251,000)
12 months or longer, Fair Value | 131,319,000 |  | 131,319,000 |  | 82,396,000
12 months or longer, Unrealized losses | (6,476,000) |  | (6,476,000) |  | (2,613,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 490,053,000 |  | 490,053,000 |  | 371,547,000
Total Unrealized Losses | 14,430,000 |  | 14,430,000 |  | 5,864,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 14,430,000 |  | 14,430,000 |  | 5,864,000
Credit losses on trust preferred securities held [Abstract] |  |  |  |  |
Beginning of period |  |  | 1,111,000 | $ 1,111,000 |
Additions related to OTTI losses not previously recognized |  |  | 0 | 0 |
Reductions due to sales / (recoveries) |  |  | (1,111,000) | 0 |
Reductions due to change in intent or likelihood of sale |  |  | 0 | 0 |
Additions related to increases in previously recognized OTTI losses |  |  | 0 | 0 |
Reductions due to increases in expected cash flows |  |  | 0 | 0 |
End of period | 0 | $ 1,111,000 | 0 | 1,111,000 |
Gain (Loss) on Sale of Securities, Net | 881,000 | $ 335,000 | 901,000 | $ 335,000 |
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |  |  |
One year or less | 85,405,000 |  | 85,405,000 |  |
After 1 through 5 years | 37,633,000 |  | 37,633,000 |  |
After 5 through 10 years | 0 |  | 0 |  |
After ten years | 0 |  | 0 |  |
Fair Value | 123,038,000 |  | 123,038,000 |  | 113,770,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount | 39,994,000 |  | 39,994,000 |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 29,389,000 |  | 29,389,000 |  |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 0 |  | 0 |  |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | 0 |  | 0 |  |
Held-to-maturity Securities | 69,383,000 |  | 69,383,000 |  | 69,332,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 74,660,000 |  | 74,660,000 |  | 58,584,000
Less than 12 months, Unrealized Losses | (1,917,000) |  | (1,917,000) |  | (540,000)
12 months or longer, Fair Value | 48,378,000 |  | 48,378,000 |  | 47,972,000
12 months or longer, Unrealized losses | (2,387,000) |  | (2,387,000) |  | (1,494,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 123,038,000 |  | 123,038,000 |  | 106,556,000
Total Unrealized Losses | $ 4,304,000 |  | $ 4,304,000 |  | $ 2,034,000
Number of securities in Unrealized Loss Positions | securities | 12 |  | 12 |  | 11
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 4,304,000 |  | $ 4,304,000 |  | $ 2,034,000
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 29,438,000 |  | 29,438,000 |  | 34,101,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (387,000) |  | (387,000) |  | (525,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 38,087,000 |  | 38,087,000 |  | 14,540,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,471,000) |  | (1,471,000) |  | (453,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 67,525,000 |  | 67,525,000 |  | 48,641,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,858,000) |  | $ (1,858,000) |  | $ (978,000)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 7 |  | 7 |  | 7
Obligations of states and political subdivisions |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |  |  |
One year or less | $ 16,785,000 |  | $ 16,785,000 |  |
After 1 through 5 years | 77,266,000 |  | 77,266,000 |  |
After 5 through 10 years | 80,129,000 |  | 80,129,000 |  |
After ten years | 1,060,000 |  | 1,060,000 |  |
Fair Value | 175,240,000 |  | 175,240,000 |  | $ 166,266,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 72,991,000 |  | 72,991,000 |  | 42,618,000
Less than 12 months, Unrealized Losses | (1,357,000) |  | (1,357,000) |  | (769,000)
12 months or longer, Fair Value | 14,936,000 |  | 14,936,000 |  | 9,267,000
12 months or longer, Unrealized losses | (843,000) |  | (843,000) |  | (256,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 87,927,000 |  | 87,927,000 |  | 51,885,000
Total Unrealized Losses | $ 2,200,000 |  | $ 2,200,000 |  | $ 1,025,000
Number of securities in Unrealized Loss Positions | securities | 33 |  | 33 |  | 39
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 2,200,000 |  | $ 2,200,000 |  | $ 1,025,000
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 14,936,000 |  | 14,936,000 |  | 9,267,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (843,000) |  | (843,000) |  | (256,000)
Mortgage-backed securities: GSE residential |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |  |  |
One year or less | 0 |  | 0 |  |
After 1 through 5 years | 104,930,000 |  | 104,930,000 |  |
After 5 through 10 years | 176,494,000 |  | 176,494,000 |  |
After ten years | 34,247,000 |  | 34,247,000 |  |
Fair Value | 315,671,000 |  | 315,671,000 |  | 293,811,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 211,083,000 |  | 211,083,000 |  | 187,949,000
Less than 12 months, Unrealized Losses | (4,680,000) |  | (4,680,000) |  | (1,942,000)
12 months or longer, Fair Value | 68,005,000 |  | 68,005,000 |  | 22,609,000
12 months or longer, Unrealized losses | (3,246,000) |  | (3,246,000) |  | (518,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 279,088,000 |  | 279,088,000 |  | 210,558,000
Total Unrealized Losses | $ 7,926,000 |  | $ 7,926,000 |  | $ 2,460,000
Number of securities in Unrealized Loss Positions | securities | 28 |  | 28 |  | 26
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 7,926,000 |  | $ 7,926,000 |  | $ 2,460,000
Trust preferred securities |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |  |  |
One year or less | 0 |  | 0 |  |
After 1 through 5 years | 0 |  | 0 |  |
After 5 through 10 years | 0 |  | 0 |  |
After ten years | 0 |  | 0 |  |
Fair Value | 0 |  | 0 |  | 2,548,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Less than 12 months, Fair Value |  |  |  |  | 0
Less than 12 months, Unrealized Losses |  |  |  |  | 0
12 months or longer, Fair Value |  |  |  |  | 2,548,000
12 months or longer, Unrealized losses |  |  |  |  | (345,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  |  |  |  | 2,548,000
Total Unrealized Losses |  |  |  |  | $ 345,000
Number of securities in Unrealized Loss Positions | securities |  |  |  |  | 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  | $ 345,000
Credit losses on trust preferred securities held [Abstract] |  |  |  |  |
Gain (Loss) on Sale of Securities, Net | 846,000 |  |  |  |
Other securities |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |  |  |
One year or less | 0 |  | 0 |  |
After 1 through 5 years | 2,013,000 |  | 2,013,000 |  |
After 5 through 10 years | 0 |  | 0 |  |
After ten years | 341,000 |  | 341,000 |  |
Fair Value | 2,354,000 |  | 2,354,000 |  | 2,184,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 |  | $ 0 |  | $ 0

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- Definition The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after five through ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition The yield on an available for sale government security, when the effect of reduced taxes are taken into account, for securities that mature after ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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