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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 3,003,018,000 | $ 2,513,540,000
Gross Unrealized Gains | 9,571,000 | 19,244,000
Gross Unrealized Losses | 51,965,000 | 17,501,000
Securities available-for-sale, at fair value | 2,960,624,000 | 2,515,283,000
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 96,941,000 |
Due in five years to ten years | 177,898,000 |
Due after ten years | 1,221,105,000 |
Mortgage-backed securities | 1,302,274,000 |
Asset-backed securities | 204,800,000 |
Amortized Cost | 3,003,018,000 |
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 97,087,000 |
Due in five years to ten years | 177,231,000 |
Due after ten years | 1,204,361,000 |
Mortgage-backed securities | 1,277,273,000 |
Asset-backed securities | 204,672,000 |
Securities available-for-sale, at fair value | 2,960,624,000 | 2,515,283,000
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount | 0 |
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 20,677,000 | 20,762,000
Gross Unrealized Gains | 46,000 | 114,000
Gross Unrealized Losses | 120,000 | 46,000
Securities held-to-maturity, fair value | 20,603,000 | 20,830,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Due in one year to five years | 7,496,000 |
Due in five years to ten years | 10,385,000 |
Due after ten years | 2,796,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Amortized Cost | 20,677,000 | 20,762,000
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 7,489,000 |
Due in five years to ten years | 10,316,000 |
Due after ten years | 2,798,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Fair Value | 20,603,000 | 20,830,000
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 31,002,000 | 30,505,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 56,000 | 60,000
Securities available-for-sale, at fair value | 30,946,000 | 30,445,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 30,946,000 | 30,445,000
U.S. government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 176,305,000 | 182,500,000
Gross Unrealized Gains | 43,000 | 67,000
Gross Unrealized Losses | 2,905,000 | 1,766,000
Securities available-for-sale, at fair value | 173,443,000 | 180,801,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 173,443,000 | 180,801,000
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,302,274,000 | 1,270,625,000
Gross Unrealized Gains | 4,393,000 | 5,318,000
Gross Unrealized Losses | 29,394,000 | 12,124,000
Securities available-for-sale, at fair value | 1,277,273,000 | 1,263,819,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,277,273,000 | 1,263,819,000
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,206,777,000 | 774,949,000
Gross Unrealized Gains | 3,890,000 | 12,251,000
Gross Unrealized Losses | 18,202,000 | 2,588,000
Securities available-for-sale, at fair value | 1,192,465,000 | 784,612,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,192,465,000 | 784,612,000
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 204,800,000 | 173,346,000
Gross Unrealized Gains | 377,000 | 262,000
Gross Unrealized Losses | 505,000 | 316,000
Securities available-for-sale, at fair value | 204,672,000 | 173,292,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 204,672,000 | 173,292,000
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 81,860,000 | 81,615,000
Gross Unrealized Gains | 868,000 | 1,346,000
Gross Unrealized Losses | 903,000 | 647,000
Securities available-for-sale, at fair value | 81,825,000 | 82,314,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 81,825,000 | 82,314,000
State and municipal securities |  |
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 20,677,000 | 20,762,000
Gross Unrealized Gains | 46,000 | 114,000
Gross Unrealized Losses | 120,000 | 46,000
Securities held-to-maturity, fair value | 20,603,000 | 20,830,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 20,677,000 | 20,762,000
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | $ 20,603,000 | $ 20,830,000

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- Definition Fair value of held-to-maturity 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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(3) -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 (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Fair value of held-to-maturity debt securities maturing after 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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(4) -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 (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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