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Fair Value Measurements - Fair Value Measurement on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	$ 834,492	$ 952,312
Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	834,492
Investment securities available for sale		952,312
Equity security	111	148
Derivative assets - interest rate swaps	30,024	8,318
Derivative liabilities - interest rate swaps	30,460	8,318
U.S. government and agency securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	51,893	105,223
Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	205,310	133,014
Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	222,581	339,608
Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	304,682	327,095
Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	20,171	24,194
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	29,855	23,178
Level 1 | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	0
Investment securities available for sale		0
Equity security		148
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	834,492
Investment securities available for sale		952,312
Equity security	0	0
Derivative assets - interest rate swaps	30,024	8,318
Derivative liabilities - interest rate swaps	30,460	8,318
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		952,312
Equity security	111	148
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	51,893	105,223
Recurring | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	205,310	133,014
Recurring | Residential CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	222,581	339,608
Recurring | Commercial CMO and MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	304,682	327,095
Recurring | Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	20,171	24,194
Recurring | Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	29,855	23,178
Recurring | Interest rate swap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	30,460
Derivative assets - interest rate swaps	30,024	8,318
Derivative liabilities - interest rate swaps		8,318
Recurring | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		0
Equity security	111	148
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]
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		952,312
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	51,893	105,223
Recurring | Level 2 | Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	205,310	133,014
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		339,608
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		327,095
Recurring | Level 2 | Corporate obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale		24,194
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		23,178
Recurring | Level 2 | Interest rate swap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total investment securities available for sale	30,460
Derivative assets - interest rate swaps	30,024	8,318
Derivative liabilities - interest rate swaps		8,318
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 portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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