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Borrowings - Narrative (Detail) - USD ($)		1 Months Ended
	Jun. 26, 2014	Jun. 30, 2017	Dec. 31, 2018	Jul. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total borrowing capacity with the Federal Home Loan Bank			$ 4,100,000,000		$ 4,300,000,000
Total borrowing capacity with the Federal Reserve Bank of Philadelphia			102,500,000		142,500,000
Qualifying Loans
Debt Instrument [Line Items]
Qualifying loans			5,200,000,000		5,500,000,000
Senior Notes
Debt Instrument [Line Items]
Senior unsecured notes, interest rate		3.95%
Issue of subordinated term note	$ 25,000,000.0	$ 100,000,000
Face amount, percentage		99.775%
Interest rate, effective percentage		4.00%
Proceeds from issuance of debt		$ 98,600,000
Subordinated debt, average interest rate for the year	4.625%
Senior Notes | Senior Notes Due 2018
Debt Instrument [Line Items]
Senior unsecured notes, interest rate				6.375%
Senior unsecured notes aggregate amount				$ 63,300,000
Senior Subordinated Notes
Debt Instrument [Line Items]
Issue of subordinated term note	$ 110,000,000.0
Subordinated debt, average interest rate for the year	6.125%
Subordinated debt, basis spread on variable rate	3.443%
Redemption price, percent of principal balance	100.00%
Federal Funds Purchased
Debt Instrument [Line Items]
Aggregate availability under federal funds line			$ 522,000,000		$ 310,000,000

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