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Securities Available for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost $ 1,893,618 $ 1,751,879    
Gross Unrealized Gains 3,010 1,466    
Gross Unrealized Losses (50,363) (33,088)    
Estimated Fair Value 1,846,265 1,720,257    
Amount of other than temporary impairment loss recognized 0      
Unrealized losses on securities 32,705 21,781    
Reclassifications out of accumulated other comprehensive loss 0 301 $ 950  
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01       $ (188)
Collateralized Mortgage Obligations        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 914,710 856,193    
Gross Unrealized Gains 1,541 58    
Gross Unrealized Losses (21,129) (17,542)    
Estimated Fair Value 895,122 838,709    
Mortgage-backed Securities, Residential        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 415,659 477,676    
Gross Unrealized Gains 47 521    
Gross Unrealized Losses (13,101) (6,983)    
Estimated Fair Value 402,605 471,214    
Mortgage-backed Securities, Commercial        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 481,081 308,046    
Gross Unrealized Gains 1,024 0    
Gross Unrealized Losses (12,979) (6,681)    
Estimated Fair Value 469,126 301,365    
Corporate securities        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 5,000 4,997    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (1,174) (522)    
Estimated Fair Value 3,826 4,475    
Municipal securities        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 77,168 82,542    
Gross Unrealized Gains 398 870    
Gross Unrealized Losses (1,980) (875)    
Estimated Fair Value $ 75,586 82,537    
Total debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost   1,729,454    
Gross Unrealized Gains   1,449    
Gross Unrealized Losses   (32,603)    
Estimated Fair Value   1,698,300    
Mutual funds        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost   22,425    
Gross Unrealized Gains   17    
Gross Unrealized Losses   (485)    
Estimated Fair Value   21,957    
Credit concentration risk | Stockholders' equity | Non-US government and agency securities        
Schedule of Available-for-sale Securities [Line Items]        
Maximum exposure to any single issuer 10.00%      
Available-for-sale Securities        
Schedule of Available-for-sale Securities [Line Items]        
Unrealized losses on securities $ 32,700 $ 21,800    
Retained Earnings        
Schedule of Available-for-sale Securities [Line Items]        
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 (469)     $ (469)
Retained Earnings | Accounting Standards Update 2016-01        
Schedule of Available-for-sale Securities [Line Items]        
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 $ 469