Loans Receivable and Allowance for Loan Losses (Schedule of Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 55,562	$ 60,195
Provision (credited) charged to operations	200	5,400
Recoveries of loans previously charged-off	412	395
Loans charged-off	(821)	(3,469)
Balance at end of period	55,353	62,521
Mortgage Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	27,678	28,052
Provision (credited) charged to operations	(982)	(22)
Recoveries of loans previously charged-off	230	88
Loans charged-off	0	(117)
Balance at end of period	26,926	28,001
Commercial Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	25,693	29,814
Provision (credited) charged to operations	1,282	5,390
Recoveries of loans previously charged-off	52	127
Loans charged-off	(676)	(3,005)
Balance at end of period	26,351	32,326
Consumer Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	2,191	2,329
Provision (credited) charged to operations	(100)	32
Recoveries of loans previously charged-off	130	180
Loans charged-off	(145)	(347)
Balance at end of period	$ 2,076	$ 2,194

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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