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Commitments and Contingencies - Additional Information (Detail) - USD ($) | Nov. 07, 2018 | Sep. 09, 2015 | Dec. 31, 2018 | Dec. 31, 2017
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Contingencies And Commitments [Line Items] |  |  |  |
Commitments to extend credit |  |  | $ 1,690,000,000 | $ 924,500,000
Obligations under letters of credit |  |  | 54,300,000 | 37,600,000
Reserve for credit risk for undisbursed commitments |  |  | 9,000,000 | $ 6,300,000
Available lines of credit |  |  | 3,960,000,000 |
Loss contigency damages sought value |  | $ 2,000,000 |  |
amount awarded to the plaintiff | $ 1,340,000 |  |  |
insurance policy that covers the amount awarded to the plaintiff | 5,000,000 |  |  |
loss contingency, amount deductible | $ 100,000 |  |  |
Secured [Member] |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |
Available lines of credit |  |  | $ 3,590,000,000 |

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- Definition Commitments to extend credit. + References No definition available. + Details
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- Definition Contingencies And Commitments [Line Items] + References No definition available. + Details
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- Definition Loss contingency, insurance claims, amount deductible. + References No definition available. + Details
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- Definition Reserve for undisbursed commitments. + References No definition available. + Details
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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Details
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