Investment Securities - Debt Securities Continuous Loss Position (Details) $ in Thousands	Mar. 31, 2022 USD ($) investment	Dec. 31, 2021 USD ($) investment
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 621,996	$ 457,314
Temporarily impaired debt securities, less than 12 months, unrealized losses	45,239	9,751
Temporarily impaired debt securities, 12 months or longer, fair value	82,145	58,008
Temporarily impaired debt securities, 12 months or longer, unrealized losses	9,787	2,362
Temporarily impaired debt securities, fair value	704,141	515,322
Temporarily impaired debt securities, unrealized loss	$ 55,026	$ 12,113
Number of holdings \| investment	332	172
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 62,857	$ 62,166
Temporarily impaired debt securities, less than 12 months, unrealized losses	2,983	684
Temporarily impaired debt securities, 12 months or longer, fair value	0	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	0	0
Temporarily impaired debt securities, fair value	62,857	62,166
Temporarily impaired debt securities, unrealized loss	$ 2,983	$ 684
Number of holdings \| investment	10	9
Residential federal agency MBS
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 308,437	$ 272,863
Temporarily impaired debt securities, less than 12 months, unrealized losses	21,907	6,992
Temporarily impaired debt securities, 12 months or longer, fair value	75,993	51,281
Temporarily impaired debt securities, 12 months or longer, unrealized losses	8,970	2,121
Temporarily impaired debt securities, fair value	384,430	324,144
Temporarily impaired debt securities, unrealized loss	$ 30,877	$ 9,113
Number of holdings \| investment	78	44
Commercial federal agency MBS
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 17,560	$ 4,897
Temporarily impaired debt securities, less than 12 months, unrealized losses	603	52
Temporarily impaired debt securities, 12 months or longer, fair value	0	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	0	0
Temporarily impaired debt securities, fair value	17,560	4,897
Temporarily impaired debt securities, unrealized loss	$ 603	$ 52
Number of holdings \| investment	5	1
Taxable municipal securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 214,772	$ 117,388
Temporarily impaired debt securities, less than 12 months, unrealized losses	19,245	2,023
Temporarily impaired debt securities, 12 months or longer, fair value	6,152	6,727
Temporarily impaired debt securities, 12 months or longer, unrealized losses	817	241
Temporarily impaired debt securities, fair value	220,924	124,115
Temporarily impaired debt securities, unrealized loss	$ 20,062	$ 2,264
Number of holdings \| investment	219	118
Tax-exempt municipal securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 7,975
Temporarily impaired debt securities, less than 12 months, unrealized losses	143
Temporarily impaired debt securities, 12 months or longer, fair value	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	0
Temporarily impaired debt securities, fair value	7,975
Temporarily impaired debt securities, unrealized loss	$ 143
Number of holdings \| investment	12
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 745
Temporarily impaired debt securities, less than 12 months, unrealized losses	8
Temporarily impaired debt securities, 12 months or longer, fair value	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	0
Temporarily impaired debt securities, fair value	745
Temporarily impaired debt securities, unrealized loss	$ 8
Number of holdings \| investment	3
Subordinated corporate bonds
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 9,650
Temporarily impaired debt securities, less than 12 months, unrealized losses	350
Temporarily impaired debt securities, 12 months or longer, fair value	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	0
Temporarily impaired debt securities, fair value	9,650
Temporarily impaired debt securities, unrealized loss	$ 350
Number of holdings \| investment	5

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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