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Other Borrowings - Additional Information (Details) - USD ($) |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 09, 2020 | Apr. 21, 2020 | Oct. 10, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Oct. 13, 2016
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Paycheck protection program liquidity facility |  |  |  | $ 449,610,000 |  |
Federal Reserve Bank discount window borrowing |  |  |  | 0 | $ 0 |
Federal Home Loan Bank advances |  |  |  | $ 215,000,000 | 490,000,000 |
Federal home loan bank advances maximum borrowing capacity as percentage of total assets |  |  |  | 35.00% |  |
Federal home loan bank, required investment conversion ratio |  |  |  | 4.50 |  |
Minimum |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Federal home loan bank advances, Fixed interest rate |  |  |  | 0.00% |  |
Federal home loan bank fixed rate advances, maturity date |  |  |  | 2020-10 |  |
Maximum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Federal home loan bank advances, Fixed interest rate |  |  |  | 25.00% |  |
Federal home loan bank fixed rate advances, maturity date |  |  |  | 2021-05 |  |
Federal Reserve Bank of Chicago Discount Window Line |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Paycheck protection program liquidity facility |  |  |  | $ 449,600,000 |  |
Debt instrument, interest rate |  |  |  | 0.35% |  |
Federal Reserve Bank of Chicago Discount Window Line | Minimum |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, maturity month and year |  |  |  | 2022-04 |  |
Federal Reserve Bank of Chicago Discount Window Line | Maximum [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, maturity month and year |  |  |  | 2022-05 |  |
Federal Reserve Bank of Chicago Discount Window Line | Letter Agreement |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate spread |  | 0.35% |  |  |  |
Correspondent Bank | Ridgestone |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, amount |  |  | $ 15,000,000.0 |  |  |
Line of credit facility, extended maturity date |  |  | Oct. 09, 2020 |  |  |
Line of credit facility, interest rate terms |  |  |  | The amended revolving line of credit bears interest at either the London Interbank Offered Rate (“LIBOR”) plus 195 basis points or the Prime Rate minus 75 basis points, based on the Company’s election, which is required to be communicated at least three business days prior to the commencement of an interest period. If the Company fails to provide timely notification, the interest rate will be Prime Rate minus 75 basis points. At September 30, 2020 and December 31, 2019, the line of credit had no outstanding balance. |  |
Correspondent Bank | Ridgestone | LIBOR Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate spread |  |  | 1.95% |  |  |
Correspondent Bank | Ridgestone | Prime Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate spread |  |  | 0.75% |  |  |
Correspondent Bank | Credit agreement | Ridgestone |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, amount |  |  |  |  |  | $ 30,000,000.0
Correspondent Bank | Fourth Amendment Revolving Credit Agreement | Ridgestone |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, amount |  |  |  | $ 0 | $ 0 |
Correspondent Bank | Fourth Amendment Revolving Credit Agreement | Ridgestone | Subsequent Event |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, extended maturity date | Oct. 08, 2021 |  |  |  |  |

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- Definition Ratio applied to the conversion of required investment in Federal Home Loan Bank (FHL Bank) $1 for every $ 20. + References No definition available. + Details
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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 The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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