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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 2,698,865 | $ 2,755,806
Securities Available for Sale, Gross Unrealized Gains | 17,603 | 7,500
Securities Available for Sale, Gross Unrealized Losses | 35,388 | 72,269
Securities Available for Sale, Fair Value | 2,681,080 | 2,691,037
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 73,426 | 74,339
Securities Available for Sale, Gross Unrealized Losses | 1,283 | 2,633
Securities Available for Sale, Fair Value | 72,143 | 71,706
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 245,707 | 246,713
Securities Available for Sale, Gross Unrealized Gains | 1,833 | 360
Securities Available for Sale, Gross Unrealized Losses | 1,600 | 6,646
Securities Available for Sale, Fair Value | 245,940 | 240,427
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 1,418,881 | 1,468,912
Securities Available for Sale, Gross Unrealized Gains | 9,964 | 4,284
Securities Available for Sale, Gross Unrealized Losses | 15,813 | 29,794
Securities Available for Sale, Fair Value | 1,413,032 | 1,443,402
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 798,447 | 799,060
Securities Available for Sale, Gross Unrealized Gains | 4,594 | 1,953
Securities Available for Sale, Gross Unrealized Losses | 15,207 | 30,936
Securities Available for Sale, Fair Value | 787,834 | 770,077
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 158,904 | 163,282
Securities Available for Sale, Gross Unrealized Gains | 1,212 | 903
Securities Available for Sale, Gross Unrealized Losses | 1,485 | 2,260
Securities Available for Sale, Fair Value | 158,631 | 161,925
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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