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Accounting Policies - Error Correction (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans, net of allowance for credit losses	$ 3,960,846		$ 3,590,331
Total assets	7,718,695		7,411,889
Borrowings	1,048,091		712,739
Total liabilities	7,073,702		6,688,680
Total liabilities and stockholders' equity	7,718,695		7,411,889
Net change in loans	(370,251)	$ 410,717
Net cash provided by investing activities	(902,327)	(140,936)
Proceeds from borrowings	668,276	227,531
Net cash provided by financing activities	340,814	774,223
Net Change in Cash and Cash Equivalents		54,460
Available for sale
Amortized Cost	1,147,467		1,153,611
Gross Unrealized Gains	209		16,800
Gross Unrealized Losses	(162,021)		(9,599)
Fair Value	985,655		1,160,812
Held to maturity
Investment securities, held to maturity	2,031,536		1,552,443
Gross Unrealized Gains	10		20,954
Gross Unrealized Losses	(390,957)		(13,406)
Fair Value	1,640,589		1,559,991
Mortgage–backed pools
Available for sale
Amortized Cost			257,185
Gross Unrealized Gains			1,914
Gross Unrealized Losses			(1,408)
Fair Value			257,691
Held to maturity
Investment securities, held to maturity			288,384
Gross Unrealized Gains			209
Gross Unrealized Losses			(4,452)
Fair Value			284,141
Federal agency mortgage–backed pools
Available for sale
Amortized Cost	226,785		257,185
Gross Unrealized Gains	0		1,914
Gross Unrealized Losses	(32,144)		(1,408)
Fair Value	194,641		257,691
Held to maturity
Investment securities, held to maturity	349,875		247,937
Gross Unrealized Gains	0		209
Gross Unrealized Losses	(57,359)		(4,010)
Fair Value	292,516		244,136
Private labeled mortgage–backed pools
Available for sale
Amortized Cost			0
Gross Unrealized Gains			0
Gross Unrealized Losses			0
Fair Value			0
Held to maturity
Investment securities, held to maturity	36,171		40,447
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(5,404)		(442)
Fair Value	$ 30,767		40,005
As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans, net of allowance for credit losses			3,553,345
Total assets			7,374,903
Borrowings			675,753
Total liabilities			6,651,694
Total liabilities and stockholders' equity			7,374,903
Net change in loans		412,873
Net cash provided by investing activities		(138,780)
Proceeds from borrowings		225,375
Net cash provided by financing activities		772,067
Net Change in Cash and Cash Equivalents		54,460
As Reported \| Mortgage–backed pools
Available for sale
Amortized Cost			257,185
Gross Unrealized Gains			1,914
Gross Unrealized Losses			(1,408)
Fair Value			257,691
Held to maturity
Investment securities, held to maturity			288,384
Gross Unrealized Gains			209
Gross Unrealized Losses			(4,452)
Fair Value			284,141
As Reported \| Federal agency mortgage–backed pools
Available for sale
Amortized Cost			225,329
Gross Unrealized Gains			1,777
Gross Unrealized Losses			(1,032)
Fair Value			226,074
Held to maturity
Investment securities, held to maturity			188,426
Gross Unrealized Gains			151
Gross Unrealized Losses			(2,612)
Fair Value			185,965
As Reported \| Private labeled mortgage–backed pools
Available for sale
Amortized Cost			31,856
Gross Unrealized Gains			137
Gross Unrealized Losses			(376)
Fair Value			31,617
Held to maturity
Investment securities, held to maturity			99,958
Gross Unrealized Gains			58
Gross Unrealized Losses			(1,840)
Fair Value			98,176
Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans, net of allowance for credit losses			36,986
Total assets			36,986
Borrowings			36,986
Total liabilities			36,986
Total liabilities and stockholders' equity			36,986
Net change in loans		(2,156)
Net cash provided by investing activities		(2,156)
Proceeds from borrowings		2,156
Net cash provided by financing activities		$ 2,156
Adjustment \| Federal agency mortgage–backed pools
Available for sale
Amortized Cost			31,856
Gross Unrealized Gains			137
Gross Unrealized Losses			(376)
Fair Value			31,617
Held to maturity
Investment securities, held to maturity			59,511
Gross Unrealized Gains			58
Gross Unrealized Losses			(1,398)
Fair Value			58,171
Adjustment \| Private labeled mortgage–backed pools
Available for sale
Amortized Cost			(31,856)
Gross Unrealized Gains			(137)
Gross Unrealized Losses			376
Fair Value			(31,617)
Held to maturity
Investment securities, held to maturity			(59,511)
Gross Unrealized Gains			(58)
Gross Unrealized Losses			1,398
Fair Value			$ (58,171)