Recent Accounting Pronouncements - Impact of ASC (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Investment Securities
Allowance for credit losses on investments	$ 218
Allowance for credit losses	36,290	$ 35,696	$ 31,146	$ 30,968	$ 31,373	$ 31,572
Unallocated
Investment Securities
Allowance for credit losses	953	1,727	268	952	1,052	1,180
Commercial
Investment Securities
Allowance for credit losses	25,992	24,424	23,292	22,523	22,045	22,084
Commercial | Commercial and industrial
Investment Securities
Allowance for credit losses	8,577	7,813	9,158	8,921	10,333	8,925
Commercial | Real estate construction
Investment Securities
Allowance for credit losses	4,709	3,646	1,446	1,332	878	783
Commercial | Commercial real estate
Investment Securities
Allowance for credit losses	12,706	12,965	12,688	12,270	10,834	12,376
Consumer
Investment Securities
Allowance for credit losses	9,345	9,545	7,586	7,493	8,276	8,308
Consumer | Other revolving and installment
Investment Securities
Allowance for credit losses	251	293	528	537	634	481
Real estate first mortgage | Consumer | Residential
Investment Securities
Allowance for credit losses	7,757	7,901	5,769	5,591	6,175	6,532
Real estate junior lien | Consumer | Residential
Investment Securities
Allowance for credit losses	1,337	$ 1,351	1,289	$ 1,365	$ 1,467	$ 1,295
Unfunded commitments
Liabilities [Abstract]
Off balance sheet liability, Allowance for loan losses	5,200		3,244
Mortgage backed securities - Residential agency
Investment Securities
Allowance for credit losses on investments	$ 103
Accounting Standards Update 2016-13 | Unfunded commitments
Liabilities [Abstract]
Off balance sheet liability, Allowance for loan losses			1,900
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13
Investment Securities
Allowance for credit losses on investments			172
Allowance for credit losses on loans and investments securities			35,175
Allowance for credit losses			35,003
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Unallocated
Investment Securities
Allowance for credit losses			984
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Commercial
Investment Securities
Allowance for credit losses			24,524
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Commercial | Commercial and industrial
Investment Securities
Allowance for credit losses			8,296
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Commercial | Real estate construction
Investment Securities
Allowance for credit losses			3,964
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Commercial | Commercial real estate
Investment Securities
Allowance for credit losses			12,264
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Consumer
Investment Securities
Allowance for credit losses			9,495
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Consumer | Other revolving and installment
Investment Securities
Allowance for credit losses			424
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Real estate first mortgage | Consumer | Residential
Investment Securities
Allowance for credit losses			7,849
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Real estate junior lien | Consumer | Residential
Investment Securities
Allowance for credit losses			1,222
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Unfunded commitments
Liabilities [Abstract]
Off balance sheet liability, Allowance for loan losses			5,159
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Obligations of state and political agencies
Investment Securities
Allowance for credit losses on investments			110
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13 | Mortgage backed securities - Residential agency
Investment Securities
Allowance for credit losses on investments			62
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Investment Securities
Allowance for credit losses on investments			172
Allowance for credit losses on loans and investments securities			4,029
Allowance for credit losses			3,857
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Unallocated
Investment Securities
Allowance for credit losses			716
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial
Investment Securities
Allowance for credit losses			1,232
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial | Commercial and industrial
Investment Securities
Allowance for credit losses			(862)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial | Real estate construction
Investment Securities
Allowance for credit losses			2,518
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial | Commercial real estate
Investment Securities
Allowance for credit losses			(424)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Consumer
Investment Securities
Allowance for credit losses			1,909
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Consumer | Other revolving and installment
Investment Securities
Allowance for credit losses			(104)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Real estate first mortgage | Consumer | Residential
Investment Securities
Allowance for credit losses			2,080
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Real estate junior lien | Consumer | Residential
Investment Securities
Allowance for credit losses			(67)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Unfunded commitments
Liabilities [Abstract]
Off balance sheet liability, Allowance for loan losses			1,915
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Obligations of state and political agencies
Investment Securities
Allowance for credit losses on investments			110
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Mortgage backed securities - Residential agency
Investment Securities
Allowance for credit losses on investments			$ 62