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Fair Value Measurements - Fair Value Measurement on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	$ 761,526	$ 802,163
Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	761,526
Equity security	210	131
Derivative assets - interest rate swaps	17,843	25,740
Derivative liabilities - interest rate swaps	17,970	26,162
U.S. government and agency securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	26,106	45,660
Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	228,166	209,968
Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	242,693	201,872
Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	235,018	303,746
Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	2,023	11,096
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	27,520	29,821
Level 1 | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0
Equity security		131
Derivative assets - interest rate swaps	0	0
Derivative liabilities - interest rate swaps	0	0
Level 2 | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	761,526
Equity security	0	0
Derivative assets - interest rate swaps	17,843	25,740
Derivative liabilities - interest rate swaps	17,970	26,162
Level 3 | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity security	0	0
Derivative assets - interest rate swaps	0	0
Derivative liabilities - interest rate swaps	0	0
Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		802,163
Equity security	210	131
Recurring | U.S. government and agency securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	26,106	45,660
Recurring | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	228,166	209,968
Recurring | Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	242,693	201,872
Recurring | Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	235,018	303,746
Recurring | Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	2,023	11,096
Recurring | Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	27,520	29,821
Recurring | Interest rate swap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative assets - interest rate swaps	17,843	25,740
Derivative liabilities - interest rate swaps	17,970	26,162
Recurring | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		0
Equity security	210	131
Recurring | Level 1 | U.S. government and agency securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 1 | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 1 | Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 1 | Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 1 | Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 1 | Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 1 | Interest rate swap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative assets - interest rate swaps	0	0
Derivative liabilities - interest rate swaps	0	0
Recurring | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		802,163
Equity security	0	0
Recurring | Level 2 | U.S. government and agency securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	26,106	45,660
Recurring | Level 2 | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	228,166	209,968
Recurring | Level 2 | Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		201,872
Recurring | Level 2 | Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		303,746
Recurring | Level 2 | Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		11,096
Recurring | Level 2 | Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		29,821
Recurring | Level 2 | Interest rate swap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative assets - interest rate swaps	17,843	25,740
Derivative liabilities - interest rate swaps	17,970	26,162
Recurring | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Equity security	0	0
Recurring | Level 3 | U.S. government and agency securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 3 | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 3 | Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 3 | Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 3 | Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 3 | Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0	0
Recurring | Level 3 | Interest rate swap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative assets - interest rate swaps	0	0
Derivative liabilities - interest rate swaps	$ 0	$ 0

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

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