Loans (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase credit deteriorated	$ 3,740,766,000	$ 2,967,247,000
Interest income recognized on non-accrual loans	32,000	80,000
Troubled debt restructurings	0	104,000
Allowance for troubled debt restructurings		0
Additional lending amount to customers whose loan terms has been modified in troubled debt restructuring	$ 0	$ 0
Number of loans modified as debt restructurings (in loans) | loan	0	0
Number of loans that subsequently default after modification (in loans) | loan	0	0
Threshold amount to individually classify loans by credit risk	$ 250,000
Loans Acquired With Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase credit deteriorated	$ 21,149,000	$ 9,861,000
PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan interest rate	1.00%
Maturities of loans originated under first round			2 years
Maturities of loans originated under second round		5 years
Amount of loans outstanding	$ 508,302,000
Remaining fees on loans outstanding	$ 21,046,000
Number of loans authorized | loan	5,671,000
Loans outstanding originated under second round		$ 487,980,000
Fees on loans originated during second round		$ 20,172,000
Forgiven loans originated during second round	$ 508,302,000
Net processing fees recognized on loans originated under second round	21,046,000
Amount of loans authorized	$ 0