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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 3,048,851 | $ 2,949,057
Securities Available for Sale, Gross Unrealized Gains | 2,064 | 7,230
Securities Available for Sale, Gross Unrealized Losses | 132,730 | 45,418
Securities Available for Sale, Fair Value | 2,918,185 | 2,910,869
U.S. Treasury and Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 94,366 | 99,535
Securities Available for Sale, Gross Unrealized Losses | 5,054 | 2,263
Securities Available for Sale, Fair Value | 89,312 | 97,272
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 243,546 | 245,997
Securities Available for Sale, Gross Unrealized Gains | 95 | 1,135
Securities Available for Sale, Gross Unrealized Losses | 10,928 | 3,346
Securities Available for Sale, Fair Value | 232,713 | 243,786
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 1,793,698 | 1,729,989
Securities Available for Sale, Gross Unrealized Gains | 1,969 | 5,611
Securities Available for Sale, Gross Unrealized Losses | 64,392 | 20,387
Securities Available for Sale, Fair Value | 1,731,275 | 1,715,213
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 770,245 | 704,518
Securities Available for Sale, Gross Unrealized Gains |  | 480
Securities Available for Sale, Gross Unrealized Losses | 47,363 | 17,863
Securities Available for Sale, Fair Value | 722,882 | 687,135
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 143,496 | 165,518
Securities Available for Sale, Gross Unrealized Gains |  | 4
Securities Available for Sale, Gross Unrealized Losses | 4,993 | 1,559
Securities Available for Sale, Fair Value | 138,503 | 163,963
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=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 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=82897076&loc=d3e27161-111563 + Details
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