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Fair Value Measurements - Fair Value Measurement on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	$ 893,558	$ 802,163
Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	893,558
Investment securities available for sale		802,163
Equity security	180	131
Derivative assets - interest rate swaps	16,955	25,740
Derivative liabilities - interest rate swaps	17,133	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	94,857	45,660
Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	227,663	209,968
Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	182,996	201,872
Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	348,169	303,746
Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	11,055	11,096
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	28,818	29,821
Level 1 | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	6,632
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	886,926
Investment securities available for sale		802,163
Equity security	0	0
Derivative assets - interest rate swaps	16,955	25,740
Derivative liabilities - interest rate swaps	17,133	26,162
Level 3 | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities available for sale	0	0
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	180	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	94,857	45,660
Recurring | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	227,663	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	182,996	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	348,169	303,746
Recurring | Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	11,055	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	28,818	29,821
Recurring | Interest rate swap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	17,133
Derivative assets - interest rate swaps	16,955	25,740
Derivative liabilities - interest rate swaps		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	180	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	5,000	0
Recurring | Level 1 | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	1,632	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]
Total investment securities available for sale	0
Derivative assets - interest rate swaps	0	0
Derivative liabilities - interest rate swaps		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	89,857	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	226,031	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	16,955	25,740
Derivative liabilities - interest rate swaps		26,162
Derivative Liability, Fair Value, Gross Liability	17,133
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]
Total investment securities available for sale	0
Derivative assets - interest rate swaps	$ 0	0
Derivative liabilities - interest rate swaps		$ 0

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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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