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Shareholders' Equity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 104,923 $ (72,585) $ (36,174)  
Net change in unrealized gain (loss) 313,796 241,047 (48,010)  
Reclassification adjustments included in earnings: [Abstract]        
Loss (gain) on available for sale securities, net (9,910) (5,597) 2,801  
Other comprehensive income (loss), before income taxes 303,886 235,450 (45,209)  
Federal and state income taxes 72,941 57,942 (11,507)  
Other comprehensive income (loss), net of income taxes 230,945 177,508 (33,702)  
Ending balance 335,868 104,923 (72,585)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 5,291,561 4,863,919 4,443,045 $ 3,518,334
Cumulative Effect, Period of Adoption, Adjustment        
Reclassification adjustments included in earnings: [Abstract]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       (2,709)
Unrealized Gain (Loss) on Available for Sale Securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 104,996 (70,999) (35,385)  
Net change in unrealized gain (loss) 312,576 239,017 (46,941)  
Reclassification adjustments included in earnings: [Abstract]        
Loss (gain) on available for sale securities, net (9,910) (5,597) 2,801  
Other comprehensive income (loss), before income taxes 302,666 233,420 (44,140)  
Federal and state income taxes 72,630 57,425 (11,235)  
Other comprehensive income (loss), net of income taxes 230,036 175,995 (32,905)  
Ending balance 335,032 104,996 (70,999)  
Unrealized Gain (Loss) on Available for Sale Securities [Member] | Cumulative Effect, Period of Adoption, Adjustment        
Reclassification adjustments included in earnings: [Abstract]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       (2,709)
Unrealized Gain (Loss) on Employee Benefit Plans [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (73) (1,586) (789)  
Net change in unrealized gain (loss) 1,220 2,030 (1,069)  
Reclassification adjustments included in earnings: [Abstract]        
Loss (gain) on available for sale securities, net 0 0 0  
Other comprehensive income (loss), before income taxes 1,220 2,030 (1,069)  
Federal and state income taxes 311 517 (272)  
Other comprehensive income (loss), net of income taxes 909 1,513 (797)  
Ending balance $ 836 $ (73) $ (1,586)  
Unrealized Gain (Loss) on Employee Benefit Plans [Member] | Cumulative Effect, Period of Adoption, Adjustment        
Reclassification adjustments included in earnings: [Abstract]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       $ 0