Fair Value of Assets and Liabilities - Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	$ 795,097	$ 592,342
Mortgage backed securities - Residential agency
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	521,595	306,719
Mortgage backed securities - Commercial
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	87,697	94,978
Asset backed securities
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	96	115
Corporate bonds
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	30,835	30,850
Recurring
Fair value, assets and liabilities measured on recurring and non recurring basis
Total available-for-sale and equity securities	795,097	592,342
Derivative instruments	12,928	13,357
Derivative liabilities	1,616	2,911
Recurring \| U.S. treasury and government agencies
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	5,683	5,907
Recurring \| Obligations of state and political agencies
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	149,191	153,773
Recurring \| Mortgage backed securities - Residential agency
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	521,595	306,719
Recurring \| Mortgage backed securities - Commercial
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	87,697	94,978
Recurring \| Asset backed securities
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	96	115
Recurring \| Corporate bonds
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	30,835	30,850
Recurring \| Level 2
Fair value, assets and liabilities measured on recurring and non recurring basis
Total available-for-sale and equity securities	795,097	592,342
Derivative instruments	12,928	13,357
Derivative liabilities	1,616	2,911
Recurring \| Level 2 \| U.S. treasury and government agencies
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	5,683	5,907
Recurring \| Level 2 \| Obligations of state and political agencies
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	149,191	153,773
Recurring \| Level 2 \| Mortgage backed securities - Residential agency
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	521,595	306,719
Recurring \| Level 2 \| Mortgage backed securities - Commercial
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	87,697	94,978
Recurring \| Level 2 \| Asset backed securities
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	96	115
Recurring \| Level 2 \| Corporate bonds
Fair value, assets and liabilities measured on recurring and non recurring basis
Investment securities, at fair value Available-for-sale	$ 30,835	$ 30,850

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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