Investment Securities - Debt Securities Continuous Loss Position (Details) $ in Thousands	Mar. 31, 2023 USD ($) investment	Dec. 31, 2022 USD ($) investment
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 104,848	$ 354,291
Temporarily impaired debt securities, less than 12 months, unrealized losses	1,876	26,157
Temporarily impaired debt securities, 12 months or longer, fair value	644,564	431,933
Temporarily impaired debt securities, 12 months or longer, unrealized losses	96,639	98,093
Temporarily impaired debt securities, fair value	749,412	786,224
Temporarily impaired debt securities, unrealized losses	$ 98,515	$ 124,250
Number of holdings \| investment	498	542
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 0	$ 2,878
Temporarily impaired debt securities, less than 12 months, unrealized losses	0	109
Temporarily impaired debt securities, 12 months or longer, fair value	43,910	40,374
Temporarily impaired debt securities, 12 months or longer, unrealized losses	2,045	2,582
Temporarily impaired debt securities, fair value	43,910	43,252
Temporarily impaired debt securities, unrealized losses	$ 2,045	$ 2,691
Number of holdings \| investment	6	6
Federal agency obligations
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value		$ 4,977
Temporarily impaired debt securities, less than 12 months, unrealized losses		37
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		4,977
Temporarily impaired debt securities, unrealized losses		$ 37
Number of holdings \| investment		1
Federal agency CMO
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 46,380	$ 164,391
Temporarily impaired debt securities, less than 12 months, unrealized losses	844	13,004
Temporarily impaired debt securities, 12 months or longer, fair value	335,270	233,051
Temporarily impaired debt securities, 12 months or longer, unrealized losses	53,952	54,794
Temporarily impaired debt securities, fair value	381,650	397,442
Temporarily impaired debt securities, unrealized losses	$ 54,796	$ 67,798
Number of holdings \| investment	98	102
Federal agency MBS
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 0	$ 9,923
Temporarily impaired debt securities, less than 12 months, unrealized losses	0	797
Temporarily impaired debt securities, 12 months or longer, fair value	19,217	9,165
Temporarily impaired debt securities, 12 months or longer, unrealized losses	2,776	2,381
Temporarily impaired debt securities, fair value	19,217	19,088
Temporarily impaired debt securities, unrealized losses	$ 2,776	$ 3,178
Number of holdings \| investment	11	11
Taxable municipal securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 20,486	$ 93,345
Temporarily impaired debt securities, less than 12 months, unrealized losses	729	10,411
Temporarily impaired debt securities, 12 months or longer, fair value	226,761	144,903
Temporarily impaired debt securities, 12 months or longer, unrealized losses	36,444	37,776
Temporarily impaired debt securities, fair value	247,247	238,248
Temporarily impaired debt securities, unrealized losses	$ 37,173	$ 48,187
Number of holdings \| investment	272	273
Tax-exempt municipal securities
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 31,239	$ 66,277
Temporarily impaired debt securities, less than 12 months, unrealized losses	155	870
Temporarily impaired debt securities, 12 months or longer, fair value	9,801	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	330	0
Temporarily impaired debt securities, fair value	41,040	66,277
Temporarily impaired debt securities, unrealized losses	$ 485	$ 870
Number of holdings \| investment	80	112
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 4,857	$ 6,294
Temporarily impaired debt securities, less than 12 months, unrealized losses	82	186
Temporarily impaired debt securities, 12 months or longer, fair value	670	0
Temporarily impaired debt securities, 12 months or longer, unrealized losses	27	0
Temporarily impaired debt securities, fair value	5,527	6,294
Temporarily impaired debt securities, unrealized losses	$ 109	$ 186
Number of holdings \| investment	25	31
Subordinated corporate bonds
Debt Securities, Available-for-sale [Line Items]
Temporarily impaired debt securities, less than 12 months, fair value	$ 1,886	$ 6,206
Temporarily impaired debt securities, less than 12 months, unrealized losses	66	743
Temporarily impaired debt securities, 12 months or longer, fair value	8,935	4,440
Temporarily impaired debt securities, 12 months or longer, unrealized losses	1,065	560
Temporarily impaired debt securities, fair value	10,821	10,646
Temporarily impaired debt securities, unrealized losses	$ 1,131	$ 1,303
Number of holdings \| investment	6	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
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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