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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Apr. 01, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	$ 740,468		$ 1,098,373
Available-for-sale Securities, Gross Unrealized Gains	18		20,373
Available-for-sale Securities, Gross Unrealized Losses	(91,661)		(9,538)
Available-for-sale investment securities	648,825		1,109,208
Investment securities not due at a single maturity date, amortized cost	305,107		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(33,925)	$ (25,300)
Investment securities not due at a single maturity date, estimated fair value	271,249		0
US Treasury Securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	9,990		9,988
Available-for-sale Securities, Gross Unrealized Gains	0		0
Available-for-sale Securities, Gross Unrealized Losses	(1,283)		(63)
Available-for-sale investment securities	8,707		9,925
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	107		373
Available-for-sale Securities, Gross Unrealized Gains	0		6
Available-for-sale Securities, Gross Unrealized Losses	(9)		0
Available-for-sale investment securities	98		379
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	201,638		512,952
Available-for-sale Securities, Gross Unrealized Gains	0		16,703
Available-for-sale Securities, Gross Unrealized Losses	(26,653)		(3,188)
Available-for-sale investment securities	174,985		526,467
Investment securities not due at a single maturity date, amortized cost	192,004
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(23,166)
Investment securities not due at a single maturity date, estimated fair value	168,905
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	117,292		213,471
Available-for-sale Securities, Gross Unrealized Gains	4		2,245
Available-for-sale Securities, Gross Unrealized Losses	(7,803)		(1,277)
Available-for-sale investment securities	109,493		214,439
Investment securities not due at a single maturity date, amortized cost	10,430		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1,762)
Investment securities not due at a single maturity date, estimated fair value	8,668		0
Private label residential mortgage and asset backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	411,441		317,089
Available-for-sale Securities, Gross Unrealized Gains	14		824
Available-for-sale Securities, Gross Unrealized Losses	(55,913)		(4,693)
Available-for-sale investment securities	355,542		313,220
Investment securities not due at a single maturity date, amortized cost	56,691		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,931)
Investment securities not due at a single maturity date, estimated fair value	50,760		0
Corporate Debt Securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost			44,500
Available-for-sale Securities, Gross Unrealized Gains			595
Available-for-sale Securities, Gross Unrealized Losses			(317)
Available-for-sale investment securities			44,778
Investment securities not due at a single maturity date, amortized cost	45,982		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,066)
Investment securities not due at a single maturity date, estimated fair value	$ 42,916		$ 0

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