Fair Value Assets and Liabilities measured on nonrecurring basis (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	$ 5,773,000	$ 1,103,000
Loans Receivable, Fair Value Disclosure	6,926,294,000	6,794,671,000
Servicing Asset at Fair Value, Amount	1,700,000	13,500,000
Other Assets, Fair Value Disclosure	6,918,326,000	6,783,848,000
Other Repossessed Assets	605,000	3,300,000
Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	5,773,000	1,103,000
Servicing Asset at Fair Value, Amount	1,717,000	13,482,000
Other Assets, Fair Value Disclosure	0	775,000
Other Repossessed Assets	0	2,750,000
Nonrecurring basis | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	200,000	272,000
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	5,573,000	831,000
Nonrecurring basis | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure		775,000
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 | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Repossessed Assets	0
Level 1 | Nonrecurring basis | Residential real estate
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	2,195,000	9,720,000
Level 2 | Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair Value, Amount	1,717,000	13,482,000
Other Assets, Fair Value Disclosure	0	0
Level 2 | Nonrecurring basis | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Repossessed Assets	0
Level 2 | Nonrecurring basis | Residential real estate
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	5,773,000	1,103,000
Loans Receivable, Fair Value Disclosure	6,924,099,000	6,784,951,000
Other Assets, Fair Value Disclosure	6,918,326,000	6,783,848,000
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	5,773,000	1,103,000
Other Assets, Fair Value Disclosure	0	775,000
Other Repossessed Assets	0	2,750,000
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	200,000	272,000
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	$ 5,573,000	831,000
Fair Value, Inputs, Level 3 [Member] | Nonrecurring basis | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure		$ 775,000