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Fair Value of Financial Instruments (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities $ 2,910,869 $ 2,516,908
Derivative assets 2,148 4,788
Derivative liabilities 3,938 26,846
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,910,869 2,516,908
Derivative assets 14,157 20,315
Derivative liabilities 14,389 27,432
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,910,869 2,516,908
Derivative assets [1] 14,157 20,315
Total recurring fair value measurements - assets 2,925,026 2,537,223
Derivative liabilities [1] 14,389 27,432
Total recurring fair value measurements - liabilities 14,389 27,432
Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 2,910,869 2,516,908
Derivative assets [1] 14,157 20,315
Total recurring fair value measurements - assets 2,925,026 2,537,223
Derivative liabilities [1] 14,389 27,432
Total recurring fair value measurements - liabilities 14,389 27,432
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 97,272 54,828
Recurring [Member] | U.S. Treasury And Government Agency Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 97,272 54,828
Recurring [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 243,786 242,155
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 243,786 242,155
Recurring [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 3,500 3,500
Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 3,500 3,500
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 1,715,213 1,611,355
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 1,715,213 1,611,355
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 687,135 402,591
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 687,135 402,591
Recurring [Member] | Collateralized Mortgage Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 163,963 202,479
Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities $ 163,963 $ 202,479
[1] For further disaggregation of derivative assets and liabilities, see Note 10 - Derivatives.