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Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance $ 3,046 $ (48,133) $ (35,305) $ (22,225)    
Other comprehensive income before reclassifications [1] 44,262 (7,845) 83,969 (33,893)    
Amounts reclassified from accumulated other comprehensive income (2) [1] (158) 57 (1,514) 40    
Net current-period other comprehensive income [1] 44,104 (7,788) 82,455 (33,853)    
Ending balance 47,150 (55,921) 47,150 (55,921)    
Unrealized Gains and Losses on Available-for-Sale Debt Securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance 352 (45,748) (33,128) (19,779)    
Other comprehensive income before reclassifications [1] 37,029 (7,845) 71,926 (33,893)    
Amounts reclassified from accumulated other comprehensive income (2) (219) [2] (4) [1] (1,636) [1] (82) [1]    
Net current-period other comprehensive income [1] 36,810 (7,849) 70,290 (33,975)    
Ending balance 37,162 (53,597) 37,162 (53,597)    
Unrealized Gains and Losses on Pension Plan Liability [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance (2,116) (2,385) (2,177) (2,446)    
Other comprehensive income before reclassifications [1] 0 0 0 0    
Amounts reclassified from accumulated other comprehensive income (2) [1] 61 61 122 122    
Net current-period other comprehensive income [1] 61 61 122 122    
Ending balance (2,055) (2,324) (2,055) (2,324)    
Unrealized gains and losses on cash flow hedge            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance 4,810 0 0 0    
Other comprehensive income before reclassifications [1] 7,233 0 12,043 0    
Amounts reclassified from accumulated other comprehensive income (2) [2] 0 0 0 0    
Net current-period other comprehensive income [1] 7,233 0 12,043 0    
Ending balance $ 12,043 $ 0 $ 12,043 $ 0    
Accounting Standards Update 2016-01 [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative Effect of New Accounting Principle in Period of Adoption         $ 46 $ 0
Accounting Standards Update 2016-01 [Member] | Unrealized Gains and Losses on Available-for-Sale Debt Securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative Effect of New Accounting Principle in Period of Adoption           157
Accounting Standards Update 2016-01 [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative Effect of New Accounting Principle in Period of Adoption           0
Accounting Standards Update 2016-01 [Member] | Unrealized gains and losses on cash flow hedge            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative Effect of New Accounting Principle in Period of Adoption           0
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative Effect of New Accounting Principle in Period of Adoption         $ 0 $ 157
[1] All amounts are net of tax. Amounts in parenthesis indicate debits.
[2]
(2) See following table for details about these reclassifications.