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Significant Accounting Policies and Basis of Presentation - Narrative (Detail) $ in Thousands |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2016 Segment | Dec. 31, 2019 USD ($) CompensationPlan derivative Segment Swap | Dec. 31, 2018 USD ($) derivative Swap | Dec. 31, 2017 USD ($) | Dec. 31, 2014 | Jan. 01, 2018 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Average reserve balances required to be maintained with federal reserve bank |  |  | $ 69,100 | $ 58,400 |  |  |
Contractual payment of principal duration (days) |  |  | 90 days |  |  |  |
Contractual terms for loans (months) |  |  | 6 months |  |  |  |
Maximum loan to value ratio |  |  | 80.00% |  |  |  |
Delinquency period for loan charge-offs (days) |  |  | 120 days |  |  |  |
Goodwill and other intangibles |  |  | $ 15,195 | 16,499 | $ 16,295 |  |
FHLB, Federal Reserve Bank, and other restricted stock |  |  | 84,214 | 89,685 |  |  |
Federal Home Loan Bank stock |  |  | $ 60,800 | 67,300 |  |  |
Percentage of tax position that will be realized or sustained upon examination |  |  | 50.00% |  |  |  |
Number of share-based compensation plans | CompensationPlan |  |  | 4 |  |  |  |
Number of reportable segments (segment) | Segment |  | 2 | 2 |  |  |  |
Collaborative arrangement, expense reimbursement |  |  | $ 7,700 | 8,400 | 2,400 |  |
Increase to loans and leases receivable allowance |  |  | $ 56,379 | $ 39,972 | $ 38,015 |  |
Accounting Standards Update 2016-01 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  |  | $ 0
Interest rate swaps | Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate swaps | Swap |  |  | 140 | 98 |  |  |
Derivative notional amount |  |  | $ 1,400,000 | $ 1,000,000 |  |  |
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate swaps | derivative |  |  | 4 | 6 |  |  |
Derivative notional amount |  |  | $ 725,000 | $ 750,000 |  |  |
Credit contracts | Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 167,100 | $ 94,900 |  |  |
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% |
Retained Earnings | Accounting Standards Update 2016-01 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  |  | 1,041
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  |  | $ (1,041)
Discounted cash flow | Fair Value Estimate |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest-only GNMA securities |  |  | $ 16,272 |  |  |  |
Subsequent Event | Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Phase-in period (years) | 3 years |  |  |  |  |  |

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