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Borrowings - Schedule of Debt (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 769,316,000 |
Advances from federal home loan banks | $ 245,117 | $ 257,359
Federal Home Loan Bank, Advances, Maturing Through 2033 |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 2.06% | 1.81%
Advances from federal home loan banks | $ 245,117 | $ 222,943
Federal Home Loan Bank, Advances, Maturing Through 2033 | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 1.17% | 1.05%
Federal Home Loan Bank, Advances, Maturing Through 2033 | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 5.24% | 5.24%
Federal Home Loan Bank, Advances, Open Repo Borrowings |  |
Debt Instrument [Line Items] |  |
Fixed interest rate |  | 1.54%
Maximum borrowing capacity |  | $ 150,000
Advances from federal home loan banks | $ 0 | $ 34,416

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 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 (b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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