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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | $ 4,637,610 | $ 2,755,806
Securities Available for Sale, Gross Unrealized Gains | 52,367 | 7,500
Securities Available for Sale, Gross Unrealized Losses | 14,673 | 72,269
Securities Available for Sale, Fair Value | 4,675,304 | 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 | 98,320 | 74,339
Securities Available for Sale, Gross Unrealized Gains | 652 |
Securities Available for Sale, Gross Unrealized Losses | 300 | 2,633
Securities Available for Sale, Fair Value | 98,672 | 71,706
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 242,016 | 246,713
Securities Available for Sale, Gross Unrealized Gains | 7,789 | 360
Securities Available for Sale, Gross Unrealized Losses |  | 6,646
Securities Available for Sale, Fair Value | 249,805 | 240,427
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 1,910,909 | 1,468,912
Securities Available for Sale, Gross Unrealized Gains | 20,268 | 4,284
Securities Available for Sale, Gross Unrealized Losses | 7,020 | 29,794
Securities Available for Sale, Fair Value | 1,924,157 | 1,443,402
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 1,570,765 | 799,060
Securities Available for Sale, Gross Unrealized Gains | 19,880 | 1,953
Securities Available for Sale, Gross Unrealized Losses | 4,178 | 30,936
Securities Available for Sale, Fair Value | 1,586,467 | 770,077
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 807,600 | 163,282
Securities Available for Sale, Gross Unrealized Gains | 3,757 | 903
Securities Available for Sale, Gross Unrealized Losses | 3,142 | 2,260
Securities Available for Sale, Fair Value | 808,215 | 161,925
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 8,000 | 3,500
Securities Available for Sale, Gross Unrealized Gains | 21 |
Securities Available for Sale, Gross Unrealized Losses | 33 |
Securities Available for Sale, Fair Value | $ 7,988 | $ 3,500

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + 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://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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