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Significant Accounting Policies and Basis of Presentation - Narrative (Detail) |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Jul. 11, 2016 USD ($) | Dec. 31, 2016 Segment | Jun. 30, 2016 Segment | Dec. 31, 2018 USD ($) derivative Segment CompensationPlan Swap swap | Dec. 31, 2017 USD ($) derivative Swap | Dec. 31, 2016 USD ($) | Dec. 31, 2014 | Jan. 01, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Average reserve balances required to be maintained with federal reserve bank |  |  |  |  | $ 58,400,000 | $ 164,700,000 |  |  |
Held to maturity securities |  |  |  |  | $ 0 | 0 |  |  |
Contractual payment of principal duration (days) |  |  |  |  | 90 days |  |  |  |
Contractual terms for loans (months) |  |  |  |  | 6 months |  |  |  |
Payments for termination to FDIC |  | $ 1,400,000 |  |  |  |  |  |  |
Operating lease, carrying value of assets |  |  |  |  | $ 54,500,000 | 21,700,000 |  |  |
Operating lease, accumulated depreciation |  |  |  |  | $ (4,800,000) | 500,000 |  |  |
Operating lease, term |  |  |  |  | 4 years 7 months 4 days |  |  |  |
Maximum loan to value ratio |  |  |  |  | 80.00% |  |  |  |
Delinquency period for loan charge-offs (days) |  |  |  |  | 120 days |  |  |  |
Goodwill and other intangibles |  |  |  |  | $ 16,499,000 | 16,295,000 |  |  |
FHLB, Federal Reserve Bank, and other restricted stock |  |  |  |  | 89,685,000 | 105,918,000 |  |  |
Federal Home Loan Bank stock |  |  |  |  | $ 67,300,000 | 83,700,000 |  |  |
Percentage of tax position will realized or sustained upon examination |  |  |  |  | 50.00% |  |  |  |
Number of share-based compensation plans | CompensationPlan |  |  |  |  | 4 |  |  |  |
Number of reportable segments (segment) | Segment |  |  | 2 | 1 | 2 |  |  |  |
Collaborative arrangement, expense reimbursement |  |  |  |  | $ 8,400,000 | 2,400,000 | $ 0 |  |
Unrealized gains (losses) on available-for-sale securities |  |  |  |  | (20,283,000) | 2,520,000 | $ 2,505,000 |  |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | 0 |  |  |  |
Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ 0 |  |  |  |
Net unrealized gain | $ 1,041,000 |  |  |  |  |  |  |  |
Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  | $ 550,000,000 |  |  |
Number of interest rate swaps | derivative |  |  |  |  |  | 9 |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of interest rate swaps | swap |  |  |  |  | 3 |  |  |  |
Interest Rate Swap | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 1,030,100,000.0 | $ 800,500,000.0 |  |  |
Number of interest rate swaps | Swap |  |  |  |  | 98 | 76 |  |  |
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 750,000,000 | $ 550,000,000 |  |  |
Number of interest rate swaps | derivative |  |  |  |  | 6 | 9 |  |  |
Credit contracts | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 94,900,000.0 | $ 80,500,000.0 |  |  |
ESPP |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Purchase price under employee stock purchase plan (percent) |  |  |  |  | 85.00% |  |  | 85.00% |
Purchase price under employee stock purchase plan, discount (percent) |  |  |  |  | 15.00% |  |  | 15.00% |
Equity securities |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  | $ 1,000,000 |  |  |
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment | 298,000 |  |  |  | $ 298,000 |  |  |  |
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment | 1,041,000 |  |  |  | 1,041,000 |  |  |  |
Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | (298,000) |  |  |  |
Retained Earnings | Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment | $ 1,041,000 |  |  |  | $ (1,041,000) |  |  |  |
Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  | $ 25,000,000
Operating lease, liability |  |  |  |  |  |  |  |  | $ 25,000,000

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