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Allowance for Loan and Lease Losses and Credit Quality Information - Schedule of Residential and Consumer Credit Exposure (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 8,464,562 $ 4,894,257 $ 4,805,094
% of Total Loans 100.00% 100.00%  
Accrued troubled debt restructured loans $ 14,000 $ 14,000  
Reverse mortgage, fair value 16,600 16,500 19,800
Acquired nonimpaired loans $ 3,221,316 $ 429,982 565,516
Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
% of Total Loans 0.00% 0.00%  
Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 999,879 $ 201,550 233,487
Acquired nonimpaired loans 834,820 57,708 72,304
Residential | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 7,326 761  
Residential | Nonperforming      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 12,858 11,017  
Residential | Performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 979,695 189,772  
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,128,731 680,939 558,493
Acquired nonimpaired loans 219,413 21,745 $ 35,945
Consumer | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,127 151  
Consumer | Nonperforming      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 7,374 7,883  
Consumer | Performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,119,230 672,905  
Total Residential and Consumer Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,128,610 $ 882,489  
% of Total Loans 100.00% 100.00%  
Acquired nonimpaired loans $ 1,100,000 $ 79,500  
Total Residential and Consumer Loan | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 9,453 $ 912  
% of Total Loans 0.00% 0.00%  
Total Residential and Consumer Loan | Nonperforming      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 20,232 $ 18,900  
% of Total Loans 1.00% 2.00%  
Total Residential and Consumer Loan | Performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,098,925 $ 862,677  
% of Total Loans 99.00% 98.00%