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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities Available for Sale, Gross Amortized Cost | $ 4,709,075 | $ 4,637,610 | $ 4,637,610
Securities Available for Sale, Gross Unrealized Gains | 185,281 |  | 52,367
Securities Available for Sale, Gross Unrealized Losses | 360 |  | 14,673
Securities Available for Sale, Fair Value | 4,893,996 | $ 4,675,304 | 4,675,304
U.S. Treasury And Government Agency Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities Available for Sale, Gross Amortized Cost | 107,750 |  | 98,320
Securities Available for Sale, Gross Unrealized Gains | 1,676 |  | 652
Securities Available for Sale, Gross Unrealized Losses | 223 |  | 300
Securities Available for Sale, Fair Value | 109,203 |  | 98,672
Municipal Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities Available for Sale, Gross Amortized Cost | 241,050 |  | 242,016
Securities Available for Sale, Gross Unrealized Gains | 8,643 |  | 7,789
Securities Available for Sale, Fair Value | 249,693 |  | 249,805
Residential Mortgage-Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities Available for Sale, Gross Amortized Cost | 2,061,777 |  | 1,910,909
Securities Available for Sale, Gross Unrealized Gains | 62,764 |  | 20,268
Securities Available for Sale, Gross Unrealized Losses | 10 |  | 7,020
Securities Available for Sale, Fair Value | 2,124,531 |  | 1,924,157
Commercial Mortgage-Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities Available for Sale, Gross Amortized Cost | 1,648,643 |  | 1,570,765
Securities Available for Sale, Gross Unrealized Gains | 94,268 |  | 19,880
Securities Available for Sale, Gross Unrealized Losses | 105 |  | 4,178
Securities Available for Sale, Fair Value | 1,742,806 |  | 1,586,467
Collateralized Mortgage Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities Available for Sale, Gross Amortized Cost | 641,855 |  | 807,600
Securities Available for Sale, Gross Unrealized Gains | 17,712 |  | 3,757
Securities Available for Sale, Gross Unrealized Losses |  |  | 3,142
Securities Available for Sale, Fair Value | 659,567 |  | 808,215
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Securities Available for Sale, Gross Amortized Cost | 8,000 |  | 8,000
Securities Available for Sale, Gross Unrealized Gains | 218 |  | 21
Securities Available for Sale, Gross Unrealized Losses | 22 |  | 33
Securities Available for Sale, Fair Value | $ 8,196 |  | $ 7,988

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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 Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + 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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