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Borrowings - Narrative (Detail) - USD ($)		1 Months Ended
	Jun. 26, 2014	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2013	Aug. 31, 2013
Debt Instrument [Line Items]
FHLB advances			$ 1,611,860,000	$ 868,800,000
Year three, amount				$ 180,000,000
Year three, rate				1.32%
Total borrowing capacity with the Federal Home Loan Bank			4,300,000,000	$ 4,100,000,000
Total borrowing capacity with the Federal Reserve Bank of Philadelphia			142,500,000	158,600,000
Qualifying Loans
Debt Instrument [Line Items]
Qualifying loans			$ 5,500,000,000	4,800,000,000
FHLB Fixed Rate Advances
Debt Instrument [Line Items]
FHLB advances				170,000,000
Senior Notes
Debt Instrument [Line Items]
Issue of subordinated term note	$ 25,000,000.0	$ 100,000,000
Face amount, percentage		99.775%
Interest rate, effective percentage		4.00%
Senior unsecured notes, interest rate		3.95%
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]
Issue of subordinated term note					$ 63,300,000.0
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			$ 310,000,000	$ 237,000,000

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