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Fair Value Measurements - Mortgage Servicing Rights - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Available for sale debt securities, fair value	$ 276,013	$ 198,030
Mortgage servicing rights, fair value	2,775	2,445
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available for sale debt securities, fair value	3,034	2,798
Assets, Total	93,527	199,209
Other Observable Inputs (Level 2)
Assets:
Available for sale debt securities, fair value	272,979	195,232
Assets, Total	281,423	204,004
Significant Unobservable Inputs (Level 3)
Assets:
Available for sale debt securities, fair value	0	0
Assets, Total	1,302,221	1,293,956
Recurring
Assets:
Assets, Total	278,833	200,507
Recurring | U.S. Treasury
Assets:
Available for sale debt securities, fair value	3,034	2,798
Recurring | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	2,068	11,929
Recurring | U.S. government-sponsored enterprises
Assets:
Available for sale debt securities, fair value	19,495	22,874
Recurring | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	106,245	58,744
Recurring | Mortgage-backed securities
Assets:
Available for sale debt securities, fair value	134,638	90,112
Recurring | Other debt securities
Assets:
Available for sale debt securities, fair value	9,289	10,344
Recurring | Bank issued trust preferred securities
Assets:
Available for sale debt securities, fair value	1,244	1,229
Recurring | Equity securities
Assets:
Available for sale debt securities, fair value	45	32
Recurring | Mortgage servicing rights (MSRs)
Assets:
Mortgage servicing rights, fair value	2,775	2,445
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Assets, Total	3,079	2,830
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	3,034	2,798
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government-sponsored enterprises
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other debt securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Bank issued trust preferred securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets:
Available for sale debt securities, fair value	45	32
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights (MSRs)
Assets:
Mortgage servicing rights, fair value	0	0
Recurring | Other Observable Inputs (Level 2)
Assets:
Assets, Total	272,979	195,232
Recurring | Other Observable Inputs (Level 2) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Other Observable Inputs (Level 2) | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	2,068	11,929
Recurring | Other Observable Inputs (Level 2) | U.S. government-sponsored enterprises
Assets:
Available for sale debt securities, fair value	19,495	22,874
Recurring | Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	106,245	58,744
Recurring | Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets:
Available for sale debt securities, fair value	134,638	90,112
Recurring | Other Observable Inputs (Level 2) | Other debt securities
Assets:
Available for sale debt securities, fair value	9,289	10,344
Recurring | Other Observable Inputs (Level 2) | Bank issued trust preferred securities
Assets:
Available for sale debt securities, fair value	1,244	1,229
Recurring | Other Observable Inputs (Level 2) | Equity securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Other Observable Inputs (Level 2) | Mortgage servicing rights (MSRs)
Assets:
Mortgage servicing rights, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Assets, Total	2,775	2,445
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and federal agency obligations
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government-sponsored enterprises
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Other debt securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Bank issued trust preferred securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Equity securities
Assets:
Available for sale debt securities, fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights (MSRs)
Assets:
Mortgage servicing rights, fair value	$ 2,775	$ 2,445

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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