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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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- Definition Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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