Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Fair Value Measurements
Impaired loans with a specific allowance	$ 1,518,853		$ 1,539,147
Allowance for credit loss	23,675	$ 21,979	23,744	$ 15,588
Total charge-offs	124	93	628
Collateral dependent impaired loans
Fair Value Measurements
Impaired loans with a specific allowance	6,700	18,400
Allowance for credit loss	2,880	100	$ 1,483
Total charge-offs	$ 30	$ 10

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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