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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Amortized Cost - Due within one year | $ 0 |
Amortized Cost - Due after one year through five years | 2,171 |
Amortized Cost - Due after five years through ten years | 28,847 |
Amortized Cost - Due after ten years | 17,531 |
Amortized Cost | 1,075,767 | $ 1,014,060
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Estimated Fair Value - Due within one year | 0 |
Estimated Fair Value - Due after one year through five years | 2,338 |
Estimated Fair Value - Due after five years through ten years | 30,177 |
Estimated Fair Value - Due after ten years | 16,992 |
Estimated Fair Value | 1,087,897 | 1,010,556
Available-for-sale Securities, Restricted | 350,400 | 359,600
Trust Preferred Security [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Amortized Cost | 4,549 | 4,545
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Estimated Fair Value | 3,394 | 3,749
GSE collateralized mortgage obligations |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Amortized Cost - no single maturity date | 493,539 |
Amortized Cost | 493,539 | 454,096
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Estimated Fair Value - no single maturity date | 498,026 |
Estimated Fair Value | 498,026 | 449,980
GSE mortgage-backed securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Amortized Cost - no single maturity date | 520,254 |
Amortized Cost | 520,254 | 497,889
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Estimated Fair Value - no single maturity date | 526,910 |
Estimated Fair Value | 526,910 | 498,047
Mutual funds - GSE mortgage related securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Amortized Cost - no single maturity date | 13,425 |
Amortized Cost | 13,425 | 13,425
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Estimated Fair Value - no single maturity date | 13,454 |
Estimated Fair Value | $ 13,454 | $ 13,269

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- Definition This item represents the cost of debt and equity 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 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 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=27724398&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=27724398&loc=d3e27198-111563 + Details
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