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Investment Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Estimated Fair Value | $ 1,436,266 | $ 1,301,915
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | 48,190 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | 48,924 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | 149,302 | 140,562
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Due one through five years | 220,000 |
Due five through ten years | 307,605 |
Total | 527,605 |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Due one through five years | 219,135 |
Due five through ten years | 302,928 |
Estimated Fair Value | $ 522,063 | 538,064
Available for Sale Securities Weighted Avg Yield | 1.94% |
Available for Sale Securities Debt Maturities After Five Through Ten Years Weighted Avg Yield | 2.40% |
Available for Sale Securities Debt Maturities After One Through Five Years Weighted Avg Yield | 1.29% |
Obligations of States and Political Subdivisions |  |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | $ 48,190 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | 48,924 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | $ 48,190 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Held to Maturity Securities weighted avg yield | 4.65% |
U.S. Government sponsored entity asset-backed securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Total | $ 907,989 |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Estimated Fair Value | $ 911,493 | 761,153
Available for Sale Securities Weighted Avg Yield | 2.23% |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | $ 101,112 | $ 140,562
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Held to Maturity Securities weighted avg yield | 3.42% |

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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=27724398&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 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 Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. 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 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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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