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v3.21.2

Borrowings - Additional Information (Details) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 15, 2021 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) agreement | Dec. 31, 2020 USD ($) agreement | Dec. 31, 2007 USD ($) security | Sep. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured lines of credit issued | agreement |  |  | 1 | 1 |  |
Pledge on certain loan amount |  |  | $ 10,000,000 | $ 10,000,000 |  |
Line of credit, outstanding amount |  |  | 0 | 0 |  |
Remaining borrowing capacity |  |  | 879,246,000 |  |  |
Federal home loan balance |  |  | 1,245,840,000 |  |  |
Advances from the FHLB |  |  | 0 | 0 |  |
Prepayments of the FHLB borrowings |  |  |  | 190,401,000 |  |
Naming applicable municipalities as beneficiaries |  |  | $ 27,750,000 | $ 57,250,000 |  |
LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, basis spread on variable rate |  |  | 2.75% |  |  |
Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of preferred trust securities | security |  |  |  |  | 2 |
Floating rate trust preferred securities |  |  |  |  | $ 10,000,000 |
Effective percentage |  |  | 1.67% | 1.80% |  |
Trust preferred securities, interest payment deferment period |  |  | 5 years |  |  |
Subordinated Debt | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, basis spread on variable rate |  |  | 1.55% |  |  |
Notes Maturing In October 2026 | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate trust preferred securities |  |  |  |  |  | $ 50,000,000
Interest rate, percentage |  |  |  |  |  | 5.75%
Notes Maturing In October 2026 | Subordinated Debt | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, percentage | 5.75% |  |  |  |  |
Debt instrument, repurchased face amount | $ 50,000,000 |  |  |  |  |
Notes Maturing In October 2026 | Subordinated Debt | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, percentage |  |  |  |  |  | 4.55%
Notes Maturing In October 2031 | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate trust preferred securities |  | $ 85,000,000 |  |  |  |
Interest rate, percentage |  | 3.25% |  |  |  |
Proceeds from issuance of subordinated notes, net of issuance costs |  | $ 83,500,000 |  |  |  |
Notes Maturing In October 2031 | Subordinated Debt | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, percentage | 3.25% |  |  |  |  |
Proceeds from issuance of subordinated notes, net of issuance costs | $ 85,000,000 |  |  |  |  |
Notes Maturing In October 2031 | Subordinated Debt | SOFR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, basis spread on variable rate |  |  | 2.58% |  |  |
Line of Credit | Overnight Borrowing Agreements |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, outstanding amount |  |  | $ 0 | $ 0 |  |

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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=120391452&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=120398452&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=120400017&loc=d3e572229-122910 + Details
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