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Fair Value Measurements - Estimated fair value of company's financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Federal funds sold	$ 25,785	$ 28,200
Interest bearing deposits with other banks	1,708,374	1,752,420
Investment securities	1,368,909	1,150,885
Bank owned life insurance	77,119	76,729
Interest bearing deposits	862,709	756,923
Customer repurchase agreements	20,061	26,726
Fair Value, Inputs, Level 2 | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	78	118
Carrying Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	9,112	8,435
Federal funds sold	25,785	28,200
Interest bearing deposits with other banks	1,708,374	1,752,420
Investment securities	1,369,107	1,150,885
Federal Reserve and Federal Home Loan Bank stock	33,978	40,104
Loans held for sale	142,196	88,205
Loans	7,424,619	7,650,633
Bank owned life insurance	77,119	76,729
Annuity investment	14,360	14,468
Noninterest bearing deposits	2,594,334	2,809,334
Interest bearing deposits	5,738,549	756,923
Certificates of deposit	865,961	977,760
Customer repurchase agreements	20,061	26,726
Borrowings	518,175	568,077
Carrying Value | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	2,514	5,213
Carrying Value | Interest rate swap derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	133	516
Carrying Value | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	78	118
Carrying Value | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	3,607	3,413
Derivative liability	3,486	3,574
Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	9,112	8,435
Federal funds sold	25,785	28,200
Interest bearing deposits with other banks	1,708,374	1,752,420
Investment securities	1,369,107	1,150,885
Federal Reserve and Federal Home Loan Bank stock	33,978	40,104
Loans held for sale	142,196	88,205
Loans	7,369,359	7,608,687
Bank owned life insurance	77,119	76,729
Annuity investment	14,360	14,468
Noninterest bearing deposits	2,594,334	2,809,334
Interest bearing deposits	5,738,549	756,923
Certificates of deposit	879,569	993,500
Customer repurchase agreements	20,061	26,726
Borrowings	526,754	575,435
Fair Value | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	2,514	5,213
Fair Value | Interest rate swap derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	133	516
Fair Value | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	78	118
Fair Value | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	3,607	3,413
Derivative liability	3,486	3,574
Fair Value | Fair Value, Inputs, Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	9,112	8,435
Federal funds sold	0	0
Interest bearing deposits with other banks	0	0
Investment securities	0	0
Federal Reserve and Federal Home Loan Bank stock	0	0
Loans held for sale	0	0
Loans		0
Bank owned life insurance	0	0
Annuity investment	0	0
Noninterest bearing deposits	0	0
Interest bearing deposits	0	0
Certificates of deposit	0	0
Customer repurchase agreements	0	0
Borrowings	0	0
Fair Value | Fair Value, Inputs, Level 1 | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Fair Value | Fair Value, Inputs, Level 1 | Interest rate swap derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 1 | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 1 | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	0	0
Federal funds sold	25,785	28,200
Interest bearing deposits with other banks	1,708,374	1,752,420
Investment securities	1,367,607	1,149,385
Federal Reserve and Federal Home Loan Bank stock	33,978	40,104
Loans held for sale	142,196	88,205
Loans		0
Bank owned life insurance	77,119	76,729
Annuity investment	14,360	14,468
Noninterest bearing deposits	2,594,334	2,809,334
Interest bearing deposits	5,738,549	756,923
Certificates of deposit	879,569	993,500
Customer repurchase agreements	20,061	26,726
Borrowings	526,754	575,435
Fair Value | Fair Value, Inputs, Level 2 | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Fair Value | Fair Value, Inputs, Level 2 | Interest rate swap derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	133	516
Fair Value | Fair Value, Inputs, Level 2 | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	3,607	3,413
Derivative liability	3,486	3,574
Fair Value | Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	0	0
Federal funds sold	0
Interest bearing deposits with other banks	0
Investment securities	1,500	1,500
Federal Reserve and Federal Home Loan Bank stock	0	0
Loans held for sale	0	0
Loans	7,369,359	7,608,687
Bank owned life insurance	0	0
Annuity investment	0	0
Noninterest bearing deposits	0	0
Interest bearing deposits	0	0
Certificates of deposit	0	0
Customer repurchase agreements	0	0
Borrowings	0	0
Fair Value | Fair Value, Inputs, Level 3 | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	2,514	5,213
Fair Value | Fair Value, Inputs, Level 3 | Interest rate swap derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 3 | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 3 | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Derivative liability	$ 0	$ 0

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- Definition

The aggregate fair value of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

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Fair value amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of other liabilities.

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The aggregate value of all restricted investments.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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