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Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)
6 Months Ended
Jan. 01, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2013
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Securities held to maturity   $ 660,048,000   $ 738,099,000  
Potential credit loss exposure   31,500,000      
Reclassification of Securities available for sale to securities held to maturity         $ 1,099,000,000.000
Net unrealized holding loss on AFS Securities at date of transfer         46,600,000
Net unrealized holding losses on AFS Securities, net of tax at date of transfer         $ 28,800,000
Net unamortized, unrealized loss on transfer of securities   10,500,000   12,100,000  
Net unamortized, unrealized loss on transfer of securities, net of tax   7,900,000   9,100,000  
Other-than-temporary impairments     $ 0    
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law   1,974,000,000   1,770,000,000  
Pledged securities providing additional contingency funding   0   $ 0  
30 Days or More Past Due [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Held-to-maturity, past due   0      
Securities Available for Sale [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable   4,200,000      
Securities Held to Maturity [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable   1,400,000      
Reserve for credit loss   0      
Held-to-maturity nonnaccrual   0      
ASU 2016-13 [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Cumulative effect adjustment through retained earnings $ 19,900,000        
Securities held to maturity   660,000,000.0      
ASU 2016-13 [Member] | Securities Available for Sale [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Expected credit loss   0      
Cumulative effect adjustment through retained earnings 0        
ASU 2016-13 [Member] | Securities Held to Maturity [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Cumulative effect adjustment through retained earnings $ 0        
Current expected credit loss   $ 0