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Changes In Accumulated Other Comprehensive Income (Loss) By Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ 920,964 $ 855,872 $ 553,902  
Ending balance 956,816 920,964 855,872  
Reclassification, available for sale debt securities, before tax (18,659) 8,800 (7,237)  
Unrealized gains (losses), available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (249) (2,681)    
Balance after reclassification adjustments   (1,458)    
Other comprehensive income (loss) before reclassifications (34,091) 7,800    
Amounts reclassified from accumulated other comprehensive income (loss) to net income 13,808 (5,368)    
Net current-period other comprehensive income (loss) (20,283) 2,432    
Ending balance (21,741) (249) (2,681)  
Foreign currency items, available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance 88 0    
Balance after reclassification adjustments   0    
Other comprehensive income (loss) before reclassifications 0 88    
Amounts reclassified from accumulated other comprehensive income (loss) to net income 0 0    
Net current-period other comprehensive income (loss) 0 88    
Ending balance 0 88 0  
Total unrealized gains (losses), available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (161) (2,681)    
Balance after reclassification adjustments   (1,458)    
Other comprehensive income (loss) before reclassifications (34,091) 7,888    
Amounts reclassified from accumulated other comprehensive income (loss) to net income 13,808 (5,368)    
Net current-period other comprehensive income (loss) (20,283) 2,520    
Ending balance (21,741) (161) (2,681)  
Unrealized loss on cash flow hedge        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (198) (2,211)    
Balance after reclassification adjustments   (240)    
Other comprehensive income (loss) before reclassifications 1,477 406    
Amounts reclassified from accumulated other comprehensive income (loss) to net income (2,159) 1,607    
Net current-period other comprehensive income (loss) (682) 2,013    
Ending balance (922) (198) (2,211)  
Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (359) (4,892) (7,984)  
Balance after reclassification adjustments   (1,698)    
Other comprehensive income (loss) before reclassifications (32,614) 8,294    
Amounts reclassified from accumulated other comprehensive income (loss) to net income 11,649 (3,761)    
Net current-period other comprehensive income (loss) (20,965) 4,533    
Ending balance (22,663) (359) $ (4,892)  
Gain on Investments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Reclassification, available for sale debt securities, before tax 18,700 8,800    
Reclassification, available for sale debt securities, after tax 13,800 5,400    
Interest expense        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Reclassification, cash flow hedge, before tax 95      
Reclassification, cash flow hedge, after tax 70      
Non-interest income        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Reclassification, cash flow hedge, before tax 2,800 2,600    
Reclassification, cash flow hedge, after tax 2,100 $ 1,600    
Accounting Standards Update 2018-02        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment 0      
Accounting Standards Update 2018-02 | Unrealized gains (losses), available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       $ (256)
Accounting Standards Update 2018-02 | Foreign currency items, available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       0
Accounting Standards Update 2018-02 | Total unrealized gains (losses), available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       (256)
Accounting Standards Update 2018-02 | Unrealized loss on cash flow hedge        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       (42)
Accounting Standards Update 2018-02 | Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment (298)     (298)
Accounting Standards Update 2016-01        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment 0      
Accounting Standards Update 2016-01 | Unrealized gains (losses), available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       (953)
Accounting Standards Update 2016-01 | Foreign currency items, available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       (88)
Accounting Standards Update 2016-01 | Total unrealized gains (losses), available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       (1,041)
Accounting Standards Update 2016-01 | Unrealized loss on cash flow hedge        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       0
Accounting Standards Update 2016-01 | Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment $ (1,041)     (1,041)
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Cumulative effect adjustment       $ (1,300)