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Investment Securities, Part II (Details) | 9 Months Ended |
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Sep. 30, 2017 USD ($) securities | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) securities
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | $ 95,422,000 |  |
After 1 through 5 years | 336,675,000 |  |
After 5 through 10 years | 184,565,000 |  |
After ten years | 4,542,000 |  |
Fair Value | $ 621,204,000 |  | $ 619,848,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths) | 2.23% |  |
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths) | 2.56% |  |
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths) | 2.68% |  |
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths) | 2.57% |  |
Available-for-sale , Weighted Average Yield, Maturities (in hundredths) | 2.55% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths) | 2.65% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths) | 3.02% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths) | 3.47% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths) | 3.41% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths) | 3.10% |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |
Held-to-maturity Securities | $ 69,306,000 |  | 74,231,000
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 | 1.90% |  |
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 | 1.90% |  |
Tax rate used to calculate tax-equivalent yields (in hundredths) | 35.00% |  |
Percentage investment book value exceeds total stockholders' equity (in hundredths) | 10.00% |  |
Investment Securities Pledged as Collateral | $ 463,000,000 |  | 509,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 185,129,000 |  | 484,981,000
Less than 12 months, Unrealized Losses | (2,093,000) |  | (9,411,000)
12 months or longer, Fair Value | 22,127,000 |  | 9,525,000
12 months or longer, Unrealized losses | (700,000) |  | (1,673,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 207,256,000 |  | 494,506,000
Total Unrealized Losses | 2,793,000 |  | 11,084,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 2,793,000 |  | 11,084,000
Details of Trust Preferred Securities [Abstract] |  |  |
Coupon Rate of Trust Preferred Security | floating rate coupon of 3-month LIBOR plus 90 basis points |  |
Number of Ratios Utilized in OTTI Credit Model | 29 |  |
OTTI Cash Flow Initial Default Rate | 2.00% |  |
Period For Initial Default Rate Used In OTTI Analysis | two years |  |
Default Rate Applied For Remainder Of OTTI Analysis | 36 basis points |  |
Recovery Rate Used In OTTI Cash Flow Analysis | 10.00% |  |
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) | 0 | 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 | 1,111,000 | $ 1,111,000 |
PreTSL XXVIII [Member] |  |  |
Details of Trust Preferred Securities [Abstract] |  |  |
Book Value | 2,933,000 |  |
Fair Value | 2,701,000 |  |
Unrealized Gains (Losses) | (232,000) |  |
Other-than- temporary Impairment Recorded To-date | (1,111,000) |  |
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 | 75,846,000 |  |
After 1 through 5 years | 39,439,000 |  |
After 5 through 10 years | 11,116,000 |  |
After ten years | 0 |  |
Fair Value | 126,401,000 |  | 136,324,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount | 39,993,000 |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 29,313,000 |  |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 0 |  |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | 0 |  |
Held-to-maturity Securities | 69,306,000 |  | 74,231,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 73,135,000 |  | 125,257,000
Less than 12 months, Unrealized Losses | (1,009,000) |  | (2,508,000)
12 months or longer, Fair Value | 1,003,000 |  | 0
12 months or longer, Unrealized losses | (5,000) |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 74,138,000 |  | 125,257,000
Total Unrealized Losses | 1,014,000 |  | 2,508,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,014,000 |  | 2,508,000
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 29,336,000 |  | 53,295,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (229,000) |  | (1,338,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 14,725,000 |  | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (268,000) |  | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 44,061,000 |  | 53,295,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (497,000) |  | (1,338,000)
Obligations of states and political subdivisions |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 19,153,000 |  |
After 1 through 5 years | 81,336,000 |  |
After 5 through 10 years | 70,371,000 |  |
After ten years | 1,666,000 |  |
Fair Value | 172,526,000 |  | 162,705,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 25,250,000 |  | 93,405,000
Less than 12 months, Unrealized Losses | (274,000) |  | (2,804,000)
12 months or longer, Fair Value | 9,339,000 |  | 0
12 months or longer, Unrealized losses | (212,000) |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 34,589,000 |  | 93,405,000
Total Unrealized Losses | 486,000 |  | 2,804,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 486,000 |  | 2,804,000
Mortgage-backed securities: GSE residential |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 423,000 |  |
After 1 through 5 years | 213,894,000 |  |
After 5 through 10 years | 101,040,000 |  |
After ten years | 0 |  |
Fair Value | 315,357,000 |  | 314,991,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 86,744,000 |  | 266,319,000
Less than 12 months, Unrealized Losses | (810,000) |  | (4,099,000)
12 months or longer, Fair Value | 9,084,000 |  | 5,878,000
12 months or longer, Unrealized losses | (251,000) |  | (270,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 95,828,000 |  | 272,197,000
Total Unrealized Losses | $ 1,061,000 |  | $ 4,369,000
Number of securities in Unrealized Loss Positions | securities | 5 |  | 2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 1,061,000 |  | $ 4,369,000
Trust preferred securities |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 0 |  |
After 1 through 5 years | 0 |  |
After 5 through 10 years | 0 |  |
After ten years | 2,701,000 |  |
Fair Value | 2,701,000 |  | 1,652,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 0 |  | 0
Less than 12 months, Unrealized Losses | 0 |  | 0
12 months or longer, Fair Value | 2,701,000 |  | 1,652,000
12 months or longer, Unrealized losses | (232,000) |  | (1,398,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,701,000 |  | 1,652,000
Total Unrealized Losses | $ 232,000 |  | $ 1,398,000
Number of securities in Unrealized Loss Positions | securities | 1 |  | 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 232,000 |  | $ 1,398,000
Other securities |  |  |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 0 |  |
After 1 through 5 years | 2,006,000 |  |
After 5 through 10 years | 2,038,000 |  |
After ten years | 175,000 |  |
Fair Value | 4,219,000 |  | 4,176,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 0 |  | 0
Less than 12 months, Unrealized Losses | 0 |  | 0
12 months or longer, Fair Value | 0 |  | 1,995,000
12 months or longer, Unrealized losses | 0 |  | (5,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 |  | 1,995,000
Total Unrealized Losses | 0 |  | $ 5,000
Number of securities in Unrealized Loss Positions | securities |  |  | 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 |  | $ 5,000

X
- 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 one through five 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 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 The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature in less than twelve months. 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 amount of other than temporary impairment losses on trust preferred securities which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References No definition available. + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + 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=73527792&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=73527792&loc=d3e27290-111563 + Details
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