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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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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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