Investment Securities - Amortized Cost and Fair Value - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities Available-for-Sale
Amortized cost		$ 394,213
Amortized cost.	$ 190,785
Gross unrealized (losses)	(21,701)	(36,637)
Available-for-sale, at fair value		357,576
Available-for-sale, fair value	169,084
U.S Treasuries
Securities Available-for-Sale
Amortized cost		63,480
Amortized cost.	44,765
Gross unrealized (losses)	(2,571)	(4,270)
Available-for-sale, at fair value		59,210
Available-for-sale, fair value	42,194
U.S. government and federal agencies
Securities Available-for-Sale
Amortized cost		38,748
Amortized cost.	13,821
Gross unrealized (losses)	(940)	(3,988)
Available-for-sale, at fair value		34,760
Available-for-sale, fair value	12,881
Corporate bonds
Securities Available-for-Sale
Amortized cost		3,000
Amortized cost.	3,000
Gross unrealized (losses)	(594)	(386)
Available-for-sale, at fair value		2,614
Available-for-sale, fair value	2,406
Collateralized mortgage obligations
Securities Available-for-Sale
Amortized cost		44,732
Amortized cost.	41,486
Gross unrealized (losses)	(7,964)	(6,258)
Available-for-sale, at fair value		38,474
Available-for-sale, fair value	33,522
Tax-exempt municipal
Securities Available-for-Sale
Amortized cost		4,993
Amortized cost.	1,380
Gross unrealized (losses)	(224)	(348)
Available-for-sale, at fair value		4,645
Available-for-sale, fair value	1,156
Taxable municipal
Securities Available-for-Sale
Amortized cost		608
Amortized cost.	607
Gross unrealized (losses)	(27)	(29)
Available-for-sale, at fair value		579
Available-for-sale, fair value	580
Mortgage-backed
Securities Available-for-Sale
Amortized cost		238,652
Amortized cost.	85,726
Gross unrealized (losses)	(9,381)	(21,358)
Available-for-sale, at fair value		$ 217,294
Available-for-sale, fair value	$ 76,345

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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-Section 50
-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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