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Investment Securities Investment Securities, Part III (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | $ 83,588 |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis | 128,818 |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis | 93,754 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 3,906 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 310,066 |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 628,895 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 318,829 |
Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract] |  |
AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value | 81,998 |
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value | 128,318 |
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value | 91,958 |
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value | 2,583 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date | 304,857 |
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 314,991 |
Fair Value | 619,848 | $ 518,848
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount | 44,992 |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 29,239 |
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, at amortized cost (estimated fair value of $73,096 at December 31, 2016 and $85,737 at December 31, 2015) | 74,231 | 85,208
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value | 43,798 |
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value | 29,298 |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | 0 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | 0 |
Held-to-maturity Securities, Fair Value | $ 73,096 | $ 85,737

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- Definition Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract] + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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