Debt Securities Available for Sale - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,701,379	$ 1,277,511
Gross Unrealized Gains	16,943	40,748
Gross Unrealized (Losses)	(14,475)	(1,307)
Fair Value	1,703,847	1,316,952
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34,711	24,425
Gross Unrealized Gains	404	1,124
Gross Unrealized (Losses)	(236)	0
Fair Value	34,879	25,549
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,553,491	1,163,613
Gross Unrealized Gains	14,141	37,343
Gross Unrealized (Losses)	(13,273)	(562)
Fair Value	1,554,359	1,200,394
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,159	16,845
Gross Unrealized Gains	20	17
Gross Unrealized (Losses)	0	0
Fair Value	4,179	16,862
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	109,018	67,628
Gross Unrealized Gains	2,378	2,264
Gross Unrealized (Losses)	(966)	(415)
Fair Value	$ 110,430	69,477
Trust preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		5,000
Gross Unrealized Gains		0
Gross Unrealized (Losses)		(330)
Fair Value		$ 4,670

Amount, before tax, of unrealized gain 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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Amortized cost excluding accrued interest, after allowance for credit loss, 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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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).

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