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Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss after Tax (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Jan. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 3,350,454 $ 2,533,165 $ 2,377,156      
Beginning balance, adjusted       $ 3,353,422 $ 2,515,554 $ 2,377,156
Other comprehensive income (loss) before reclassifications 35,712 (28,209) (1,296)      
Amounts reclassified from other comprehensive income (loss) 1,505 5,324 5,311      
Other comprehensive income (loss), net 37,217 (22,885) 4,015      
Ending balance 4,384,188 3,350,454 2,533,165      
Unrealized Gains and Losses on AFS Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (33,559) (12,384) (10,736)      
Beginning balance, adjusted         (12,864) (13,078)
Other comprehensive income (loss) before reclassifications 39,262 (22,932) 850      
Amounts reclassified from other comprehensive income (loss) 119 2,237 (156)      
Other comprehensive income (loss), net 39,381 (20,695) 694      
Ending balance 5,822 (33,559) (12,384)      
Unrealized Gains and Losses on Derivatives            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (4,031) (8,338) (12,464)      
Beginning balance, adjusted         (8,399) (13,942)
Other comprehensive income (loss) before reclassifications (989) 1,874 576      
Amounts reclassified from other comprehensive income (loss) 1,291 2,494 5,028      
Other comprehensive income (loss), net 302 4,368 5,604      
Ending balance (3,729) (4,031) (8,338)      
Defined Benefit Pension Plan            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (31,841) (25,283) (18,893)      
Beginning balance, adjusted         (25,283) (23,000)
Other comprehensive income (loss) before reclassifications (2,561) (7,151) (2,722)      
Amounts reclassified from other comprehensive income (loss) 95 593 439      
Other comprehensive income (loss), net (2,466) (6,558) (2,283)      
Ending balance (34,307) (31,841) (25,283)      
Total Accumulated Other Comprehensive Loss            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (69,431) (46,005) (42,093)      
Reclassification due to the adoption of ASU No. 2018-02     (7,927)      
Beginning balance, adjusted       $ (69,431) (46,546) $ (50,020)
Ending balance $ (32,214) $ (69,431) (46,005)      
ASU 2018-02 | Unrealized Gains and Losses on AFS Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of ASU No. 2018-02     (2,342)      
ASU 2018-02 | Unrealized Gains and Losses on Derivatives            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of ASU No. 2018-02     (1,478)      
ASU 2018-02 | Defined Benefit Pension Plan            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of ASU No. 2018-02     (4,107)      
ASU 2018-02 | Total Accumulated Other Comprehensive Loss            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of ASU No. 2018-02     $ (7,927)      
ASU 2016-01 | Unrealized Gains and Losses on AFS Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         (480)  
ASU 2016-01 | Unrealized Gains and Losses on Derivatives            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         0  
ASU 2016-01 | Defined Benefit Pension Plan            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         0  
ASU 2016-01 | Total Accumulated Other Comprehensive Loss            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         (480)  
ASU 2017-12 | Unrealized Gains and Losses on AFS Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         0  
ASU 2017-12 | Unrealized Gains and Losses on Derivatives            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         (61)  
ASU 2017-12 | Defined Benefit Pension Plan            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         0  
ASU 2017-12 | Total Accumulated Other Comprehensive Loss            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Reclassification due to the adoption of an ASU         $ (61)