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Loans Receivable and Allowance for Loan Losses (Schedule of Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period $ 62,862 $ 60,933 $ 61,883 $ 61,424
Provision charged (credited) to operations 500 1,000 3,700 4,200
Recoveries of loans previously charged-off 435 230 1,428 1,623
Loans charged-off (3,521) (1,075) (6,735) (6,159)
Balance at end of period 60,276 61,088 60,276 61,088
Mortgage Portfolio Segment [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 28,826 31,634 29,626 32,094
Provision charged (credited) to operations (2,301) (1,599) (2,724) (2,294)
Recoveries of loans previously charged-off 4 2 65 575
Loans charged-off (32) (383) (470) (721)
Balance at end of period 26,497 29,654 26,497 29,654
Commercial Loans [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 31,085 26,299 29,143 25,829
Provision charged (credited) to operations 3,446 2,378 6,840 6,647
Recoveries of loans previously charged-off 140 68 671 351
Loans charged-off (3,220) (506) (5,203) (4,588)
Balance at end of period 31,451 28,239 31,451 28,239
Consumer Loans [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 2,951 3,000 3,114 3,501
Provision charged (credited) to operations (645) 221 (416) (153)
Recoveries of loans previously charged-off 291 160 692 697
Loans charged-off (269) (186) (1,062) (850)
Balance at end of period 2,328 3,195 2,328 3,195
Total Portfolio Segments [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 62,862 60,933 61,883 61,424
Provision charged (credited) to operations 500 1,000 3,700 4,200
Recoveries of loans previously charged-off 435 230 1,428 1,623
Loans charged-off (3,521) (1,075) (6,735) (6,159)
Balance at end of period 60,276 61,088 60,276 61,088
Unallocated [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 0 0 0 0
Provision charged (credited) to operations 0 0 0 0
Recoveries of loans previously charged-off 0 0 0 0
Loans charged-off 0 0 0 0
Balance at end of period $ 0 $ 0 $ 0 $ 0