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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | $ 3,480,949 | $ 2,755,806
Securities Available for Sale, Gross Unrealized Gains | 71,914 | 7,500
Securities Available for Sale, Gross Unrealized Losses | 3,206 | 72,269
Securities Available for Sale, Fair Value | 3,549,657 | 2,691,037
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 93,415 | 74,339
Securities Available for Sale, Gross Unrealized Gains | 1,726 |
Securities Available for Sale, Gross Unrealized Losses |  | 2,633
Securities Available for Sale, Fair Value | 95,141 | 71,706
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 243,941 | 246,713
Securities Available for Sale, Gross Unrealized Gains | 8,222 | 360
Securities Available for Sale, Gross Unrealized Losses |  | 6,646
Securities Available for Sale, Fair Value | 252,163 | 240,427
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 1,321,109 | 1,468,912
Securities Available for Sale, Gross Unrealized Gains | 20,598 | 4,284
Securities Available for Sale, Gross Unrealized Losses | 2,236 | 29,794
Securities Available for Sale, Fair Value | 1,339,471 | 1,443,402
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 1,585,956 | 799,060
Securities Available for Sale, Gross Unrealized Gains | 39,066 | 1,953
Securities Available for Sale, Gross Unrealized Losses | 853 | 30,936
Securities Available for Sale, Fair Value | 1,624,169 | 770,077
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 232,577 | 163,282
Securities Available for Sale, Gross Unrealized Gains | 2,302 | 903
Securities Available for Sale, Gross Unrealized Losses | 63 | 2,260
Securities Available for Sale, Fair Value | 234,816 | 161,925
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 3,951 | 3,500
Securities Available for Sale, Gross Unrealized Losses | 54 |
Securities Available for Sale, Fair Value | $ 3,897 | $ 3,500

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity 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 No definition available. + Details
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