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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 2,949,057 | $ 2,562,000
Securities Available for Sale, Gross Unrealized Gains | 7,230 | 11,195
Securities Available for Sale, Gross Unrealized Losses | 45,418 | 56,287
Securities Available for Sale, Fair Value | 2,910,869 | 2,516,908
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 99,535 | 56,751
Securities Available for Sale, Gross Unrealized Losses | 2,263 | 1,923
Securities Available for Sale, Fair Value | 97,272 | 54,828
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 245,997 | 253,228
Securities Available for Sale, Gross Unrealized Gains | 1,135 | 113
Securities Available for Sale, Gross Unrealized Losses | 3,346 | 11,186
Securities Available for Sale, Fair Value | 243,786 | 242,155
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 1,729,989 | 1,620,191
Securities Available for Sale, Gross Unrealized Gains | 5,611 | 10,592
Securities Available for Sale, Gross Unrealized Losses | 20,387 | 19,428
Securities Available for Sale, Fair Value | 1,715,213 | 1,611,355
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 704,518 | 425,750
Securities Available for Sale, Gross Unrealized Gains | 480 |
Securities Available for Sale, Gross Unrealized Losses | 17,863 | 23,159
Securities Available for Sale, Fair Value | 687,135 | 402,591
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 165,518 | 202,580
Securities Available for Sale, Gross Unrealized Gains | 4 | 490
Securities Available for Sale, Gross Unrealized Losses | 1,559 | 591
Securities Available for Sale, Fair Value | 163,963 | 202,479
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 3,500 | 3,500
Securities Available for Sale, Fair Value | $ 3,500 | $ 3,500

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + 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 (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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