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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities $ 2,918,185 $ 2,910,869
Derivative assets 6,751 2,148
Derivative liabilities 309 3,938
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 2,918,185  
Derivative assets 11,411  
Derivative liabilities 28,791  
Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 2,918,185 2,910,869
Derivative assets [1] 11,411 14,157
Total recurring fair value measurements - assets 2,929,596 2,925,026
Derivative liabilities [1] 28,791 14,389
Total recurring fair value measurements - liabilities 28,791 14,389
Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 2,918,185 2,910,869
Derivative assets [1] 11,411 14,157
Total recurring fair value measurements - assets 2,929,596 2,925,026
Derivative liabilities [1] 28,791 14,389
Total recurring fair value measurements - liabilities 28,791 14,389
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 securities 89,312 97,272
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 securities 89,312 97,272
Recurring [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 232,713 243,786
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 232,713 243,786
Recurring [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 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 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 securities 1,731,275 1,715,213
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 securities 1,731,275 1,715,213
Recurring [Member] | Commercial Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 722,882 687,135
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 securities 722,882 687,135
Recurring [Member] | Collateralized Mortgage Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities 138,503 163,963
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 securities $ 138,503 $ 163,963
[1] For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.