Fair Value Assets and Liabilities measured on nonrecurring basis (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	$ 2,497,000	$ 5,773,000
Loans Receivable, Fair Value Disclosure	7,206,670,000	6,926,294,000
Servicing Asset at Fair Value, Amount	900,000	1,700,000
Other Assets, Fair Value Disclosure	7,200,851,000	6,918,326,000
Other Repossessed Assets	1,100,000	605,000
Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	2,497,000	5,773,000
Servicing Asset at Fair Value, Amount	866,000	1,717,000
Other Assets, Fair Value Disclosure	938,000	0
Nonrecurring basis | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	182,000	200,000
Nonrecurring basis | Commercial Real Estate Portfolio Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	2,315,000	5,573,000
Other Assets, Fair Value Disclosure	938,000
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	0	0
Level 1 | Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0	0
Level 1 | Nonrecurring basis | Commercial Real Estate Portfolio Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	3,322,000	2,195,000
Level 2 | Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair Value, Amount	866,000	1,717,000
Other Assets, Fair Value Disclosure	0	0
Level 2 | Nonrecurring basis | Commercial Real Estate Portfolio Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	2,497,000	5,773,000
Loans Receivable, Fair Value Disclosure	7,203,348,000	6,924,099,000
Other Assets, Fair Value Disclosure	7,200,851,000	6,918,326,000
Fair Value, Inputs, Level 3 [Member] | Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	2,497,000	5,773,000
Other Assets, Fair Value Disclosure	938,000	0
Fair Value, Inputs, Level 3 [Member] | Nonrecurring basis | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	182,000	200,000
Fair Value, Inputs, Level 3 [Member] | Nonrecurring basis | Commercial Real Estate Portfolio Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	2,315,000	$ 5,573,000
Other Assets, Fair Value Disclosure	$ 938,000