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Loans Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       $ 61,883       $ 61,424 $ 61,883 $ 61,424 $ 61,734
Provision charged to operations $ 1,900 $ 500 $ 1,700 1,500 $ 1,200 $ 1,000 $ 1,700 1,500 5,600 5,400 4,350
Recoveries of loans previously charged off                 1,653 2,009 4,168
Loans charged off                 (8,941) (6,950) (8,828)
Balance at end of period 60,195       61,883       60,195 61,883 61,424
Mortgage Portfolio Segment [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       29,626       32,094 29,626 32,094  
Provision charged to operations                 (1,139) (2,028)  
Recoveries of loans previously charged off                 66 628  
Loans charged off                 (501) (1,068)  
Balance at end of period 28,052       29,626       28,052 29,626 32,094
Commercial Portfolio Segment [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       29,143       25,829 29,143 25,829  
Provision charged to operations                 7,058 7,606  
Recoveries of loans previously charged off                 800 570  
Loans charged off                 (7,187) (4,862)  
Balance at end of period 29,814       29,143       29,814 29,143 25,829
Consumer Portfolio Segment [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       3,114       3,501 3,114 3,501  
Provision charged to operations                 (319) (178)  
Recoveries of loans previously charged off                 787 811  
Loans charged off                 (1,253) (1,020)  
Balance at end of period 2,329       3,114       2,329 3,114 3,501
Total Portfolio Segments [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       61,883       61,424 61,883 61,424  
Provision charged to operations                 5,600 5,400  
Recoveries of loans previously charged off                 1,653 2,009  
Loans charged off                 (8,941) (6,950)  
Balance at end of period 60,195       61,883       60,195 61,883 61,424
Unallocated Financing Receivables [Member]                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       $ 0       $ 0 0 0  
Provision charged to operations                 0 0  
Recoveries of loans previously charged off                 0 0  
Loans charged off                 0 0  
Balance at end of period $ 0       $ 0       $ 0 $ 0 $ 0