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Investment Securities (Details) - USD ($) $ in Thousands	Apr. 01, 2021	Sep. 30, 2021	Dec. 31, 2020
Investment securities available-for-sale
Amortized Cost		$ 655,560	$ 578,138
Unrealized Gains		7,212	14,749
Unrealized Losses		(7,490)	(545)
Fair Value		655,282	592,342
Amortized Cost		362,586
Unrealized Gains		1,585
Unrealized Losses		(631)
Fair Value		363,540
Amortized Cost		1,018,146
Unrealized Gains		8,797
Unrealized Losses		(8,121)
Fair Value		1,018,822
U. S. Treasury and agencies
Investment securities available-for-sale
Amortized Cost		5,382	5,926
Unrealized Gains		87
Unrealized Losses			(19)
Fair Value		5,469	5,907
Obligations of state and political agencies
Investment securities available-for-sale
Amortized Cost			148,491
Unrealized Gains			5,282
Fair Value			153,773
Amortized Cost		145,172
Unrealized Gains		1,530
Unrealized Losses		(29)
Fair Value		146,673
Fair value of debt securities available-for-sale transferred to held-to-maturity	$ 149,200
Net unrealized gain from available-for-sale to held-to-maturity	$ 1,300
Mortgage backed securities - Residential agency
Investment securities available-for-sale
Amortized Cost		523,743	303,760
Unrealized Gains		2,219	3,395
Unrealized Losses		(7,490)	(436)
Fair Value		518,472	306,719
Amortized Cost		217,414
Unrealized Gains		55
Unrealized Losses		(602)
Fair Value		216,867
Mortgage backed securities - Commercial
Investment securities available-for-sale
Amortized Cost		91,336	89,300
Unrealized Gains		3,582	5,678
Fair Value		94,918	94,978
Asset backed securities
Investment securities available-for-sale
Amortized Cost		61	109
Unrealized Gains		3	6
Fair Value		64	115
Corporate bonds
Investment securities available-for-sale
Amortized Cost		35,038	30,552
Unrealized Gains		1,321	388
Unrealized Losses			(90)
Fair Value		$ 36,359	$ 30,850

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