Investment Securities - Debt Securities Continuous Loss Position (Details) $ in Thousands	Sep. 30, 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	$ 511,365	$ 457,314
Temporarily impaired debt securities, less than 12 months, unrealized losses	53,070	9,751
Temporarily impaired debt securities, 12 months or longer, fair value	306,931	58,008
Temporarily impaired debt securities, 12 months or longer, unrealized losses	70,611	2,362
Temporarily impaired debt securities, fair value	818,296	515,322
Temporarily impaired debt securities, unrealized loss	$ 123,681	$ 12,113
Number of holdings \| investment	559	172
Federal agency obligations
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 5,011
Temporarily impaired debt securities, less than 12 months, unrealized losses	6
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	5,011
Temporarily impaired debt securities, unrealized loss	$ 6
Number of holdings \| investment	1
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 49,643	$ 62,166
Temporarily impaired debt securities, less than 12 months, unrealized losses	2,290	684
Temporarily impaired debt securities, 12 months or longer, fair value	30,017	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	3,915	0
Temporarily impaired debt securities, fair value	79,660	62,166
Temporarily impaired debt securities, unrealized loss	$ 6,205	$ 684
Number of holdings \| investment	12	9
Federal agency CMO
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 193,638	$ 266,313
Temporarily impaired debt securities, less than 12 months, unrealized losses	21,696	6,627
Temporarily impaired debt securities, 12 months or longer, fair value	186,439	51,281
Temporarily impaired debt securities, 12 months or longer, unrealized losses	44,757	2,121
Temporarily impaired debt securities, fair value	380,077	317,594
Temporarily impaired debt securities, unrealized loss	$ 66,453	$ 8,748
Number of holdings \| investment	101	43
Federal agency MBS
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 10,741	$ 11,447
Temporarily impaired debt securities, less than 12 months, unrealized losses	911	417
Temporarily impaired debt securities, 12 months or longer, fair value	9,237	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	2,415	0
Temporarily impaired debt securities, fair value	19,978	11,447
Temporarily impaired debt securities, unrealized loss	$ 3,326	$ 417
Number of holdings \| investment	11	2
Taxable municipal securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 160,929	$ 117,388
Temporarily impaired debt securities, less than 12 months, unrealized losses	25,059	2,023
Temporarily impaired debt securities, 12 months or longer, fair value	77,625	6,727
Temporarily impaired debt securities, 12 months or longer, unrealized losses	19,137	241
Temporarily impaired debt securities, fair value	238,554	124,115
Temporarily impaired debt securities, unrealized loss	$ 44,196	$ 2,264
Number of holdings \| investment	269	118
Tax-exempt municipal securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 78,249
Temporarily impaired debt securities, less than 12 months, unrealized losses	1,840
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	78,249
Temporarily impaired debt securities, unrealized loss	$ 1,840
Number of holdings \| investment	128
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 6,279
Temporarily impaired debt securities, less than 12 months, unrealized losses	195
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	6,279
Temporarily impaired debt securities, unrealized loss	$ 195
Number of holdings \| investment	31
Subordinated corporate bonds
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 6,875
Temporarily impaired debt securities, less than 12 months, unrealized losses	1,073
Temporarily impaired debt securities, 12 months or longer, fair value	3,613
Temporarily impaired debt securities, 12 months or longer, unrealized losses	387
Temporarily impaired debt securities, fair value	10,488
Temporarily impaired debt securities, unrealized loss	$ 1,460
Number of holdings \| investment	6

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
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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