Goodwill and other intangibles (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 159,595,000	$ 159,595,000	$ 159,595,000	$ 159,595,000	$ 159,595,000	$ 159,595,000	$ 159,595,000	$ 159,595,000
Other Intangible Assets, Net	6,316,000	7,882,000	6,316,000	7,882,000	6,657,000	7,462,000	8,302,000	9,260,000
Amortization of Intangible Assets	341,000	420,000	1,146,000	1,378,000
Finite-lived Intangible Assets Acquired	14,456,000		14,456,000			14,456,000
Indefinite-lived Intangible Assets Acquired	1,300,000		1,300,000			1,300,000
Finite-Lived Intangible Assets, Accumulated Amortization	9,440,000		9,440,000			8,294,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	341,000		341,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,323,000		1,323,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1,215,000		1,215,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1,042,000		1,042,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	887,000		887,000
Intangible Assets, Gross (Excluding Goodwill)	15,756,000		15,756,000			15,756,000
Intangible Assets, Net (Including Goodwill)	165,911,000	$ 167,477,000	165,911,000	$ 167,477,000	$ 166,252,000	167,057,000	$ 167,897,000	$ 168,855,000
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	8,140,000		8,140,000			6,994,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 1,300,000		$ 1,300,000			$ 1,300,000