Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands	Mar. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	91	30
Fair Value, Less Than 12 Months	$ 727,845	$ 372,499
Unrealized Losses, Less Than 12 Months	$ (32,878)	$ (5,393)
Number of Securities, 12 Months or More \| security	6	1
Fair Value, 12 Months or More	$ 76,343	$ 8,933
Unrealized Losses, 12 Months or More	$ (7,617)	$ (374)
Number of Securities, Total \| security	97	31
Fair Value, Total	$ 804,188	$ 381,432
Unrealized Losses, Total	$ (40,495)	$ (5,767)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	12	8
Fair Value, Less Than 12 Months	$ 119,959	$ 85,221
Unrealized Losses, Less Than 12 Months	$ (6,742)	$ (742)
Number of Securities, 12 Months or More \| security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total \| security	12	8
Fair Value, Total	$ 119,959	$ 85,221
Unrealized Losses, Total	$ (6,742)	$ (742)
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	2	0
Fair Value, Less Than 12 Months	$ 15,296	$ 0
Unrealized Losses, Less Than 12 Months	$ (256)	$ 0
Number of Securities, 12 Months or More \| security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total \| security	2	0
Fair Value, Total	$ 15,296	$ 0
Unrealized Losses, Total	$ (256)	$ 0
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	39	12
Fair Value, Less Than 12 Months	$ 309,426	$ 141,204
Unrealized Losses, Less Than 12 Months	$ (15,367)	$ (2,436)
Number of Securities, 12 Months or More \| security	4	1
Fair Value, 12 Months or More	$ 36,986	$ 8,933
Unrealized Losses, 12 Months or More	$ (3,836)	$ (374)
Number of Securities, Total \| security	43	13
Fair Value, Total	$ 346,412	$ 150,137
Unrealized Losses, Total	$ (19,203)	$ (2,810)
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	9	3
Fair Value, Less Than 12 Months	$ 8,171	$ 46,042
Unrealized Losses, Less Than 12 Months	$ (269)	$ (628)
Number of Securities, 12 Months or More \| security	2	0
Fair Value, 12 Months or More	$ 39,357	$ 0
Unrealized Losses, 12 Months or More	$ (3,781)	$ 0
Number of Securities, Total \| security	11	3
Fair Value, Total	$ 47,528	$ 46,042
Unrealized Losses, Total	$ (4,050)	$ (628)
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	29	7
Fair Value, Less Than 12 Months	$ 274,993	$ 100,032
Unrealized Losses, Less Than 12 Months	$ (10,244)	$ (1,587)
Number of Securities, 12 Months or More \| security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total \| security	29	7
Fair Value, Total	$ 274,993	$ 100,032
Unrealized Losses, Total	$ (10,244)	$ (1,587)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	0	0
Fair Value, Less Than 12 Months	$ 0	$ 0
Unrealized Losses, Less Than 12 Months	$ 0	$ 0
Number of Securities, 12 Months or More \| security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total \| security	0	0
Fair Value, Total	$ 0	$ 0
Unrealized Losses, Total	$ 0	$ 0
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months \| security	0	0
Fair Value, Less Than 12 Months	$ 0	$ 0
Unrealized Losses, Less Than 12 Months	$ 0	$ 0
Number of Securities, 12 Months or More \| security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total \| security	0	0
Fair Value, Total	$ 0	$ 0
Unrealized Losses, Total	$ 0	$ 0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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