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Investment Securities - Debt Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Investment Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, Due within one year, Amortized Cost | $ 716,640 |
Available-for-sale Securities, Due after one year through five years, Amortized Cost | 358,743 |
Available-for-sale Securities, Due after five years through ten years, Amortized Cost | 402,603 |
Available-for-sale Securities, Due after ten years, Amortized Cost | 716,435 |
Available-for-sale Securities, Amortized Cost Basis | 2,194,421 | $ 2,216,953
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] |  |
Available-for-sale Securities, Due within one year, Fair Value | 715,000 |
Available-for-sale Securities, Due after one year through five years, Fair Value | 358,688 |
Available-for-sale Securities, Due after five years through ten years, Fair Value | 405,264 |
Available-for-sale Securities, Due after ten years, Fair Value | 714,400 |
Available-for-sale securities | $ 2,193,352 | 2,215,405
Available-for-sale Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] |  |
Available-for-sale Securities, Due within one year, Weighted-Average Yield | 1.09% |
Available-for-sale Securities, Due after one year through five years, Weighted-Average Yield | 1.83% |
Available-for-sale Securities, Due after five years through ten years, Weighted-Average Yield | 2.06% |
Available-for-sale Securities, Due after ten years, Weighted-Average Yield | 2.19% |
Available-for-sale Securities, Total Weighted-Average Yield | 1.75% |
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | $ 45,032 | 45,032
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,464 | 2,589
Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] |  |
Available-for-sale securities | 4,585 | 4,819
Available-for-sale Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] |  |
Held-to-maturity Securities, Fair Value | $ 46,363 | $ 45,564
Held-to-Maturity Securities, Debt Maturities, Weighted-Average Yield | 2.80% | 2.50%

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: 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=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + 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=82897076&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 Amount after adjustments of available-for-sale debt securities at cost, maturing in the next 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 (a) -URI http://asc.fasb.org/extlink&oid=82897076&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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