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Investments - Narrative (Details) $ in Thousands	Dec. 31, 2021 USD ($) number_of_securities	Dec. 31, 2020 USD ($) number_of_securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,358,960	$ 882,682
Other investments	$ 59,896	$ 48,764
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | number_of_securities	290	30
Gross Unrealized Gains	$ 15,247	$ 30,104
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%
Available-for-sale securities pledged as collateral, fair value	$ 752,700	525,800
accrued interest receivable, held to maturity securities	3,400	3,600
Debt Securities, Held-to-maturity, Allowance for Credit Loss	614	449
Securities available-for-sale	1,366,006	912,429
Des Moines
Debt Securities, Available-for-sale [Line Items]
Other investments	12,100	10,800
Reclassified to Held to Maturity [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	331,000
Gross Unrealized Gains	21,000	$ 25,600
Securities available-for-sale	$ 352,600

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