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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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