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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities $ 4,893,996 $ 4,675,304 $ 4,675,304
Derivative assets 4 23  
Derivative liabilities 38,311 11,953  
Total recurring fair value measurements - liabilities 5,300 5,700  
Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 4,893,996 4,675,304  
Derivative assets [1] 166,869 54,446  
Total fair value measurements 5,060,865 4,729,750  
Derivative liabilities [1] 49,409 21,089  
Total recurring fair value measurements - liabilities 49,409 21,089  
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 109,203 98,672  
Recurring [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 249,693 249,805  
Recurring [Member] | Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 8,196 7,988  
Recurring [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 2,124,531 1,924,157  
Recurring [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 1,742,806 1,586,467  
Recurring [Member] | Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 659,567 808,215  
Recurring [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 4,893,996 4,675,304  
Derivative assets [1] 166,869 54,446  
Total fair value measurements 5,060,865 4,729,750  
Derivative liabilities [1] 44,064 15,385  
Total recurring fair value measurements - liabilities 44,064 15,385  
Recurring [Member] | Level 2 [Member] | U.S. Treasury And Government Agency Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 109,203 98,672  
Recurring [Member] | Level 2 [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 249,693 249,805  
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 8,196 7,988  
Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 2,124,531 1,924,157  
Recurring [Member] | Level 2 [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 1,742,806 1,586,467  
Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available for sale debt securities 659,567 808,215  
Recurring [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liabilities [1] 5,345 5,704  
Total recurring fair value measurements - liabilities $ 5,345 $ 5,704  
[1] For further disaggregation of derivative assets and liabilities, see Note 7 - Derivatives.