Fair Value Measurements, Assets and Liabilities on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Readily Available Market Prices [Member]
Loans
Agricultural	$ 0	$ 0	$ 0
Commercial and financial	0	0	0
Real Estate [Abstract]
Construction, land development and commercial	0	0	0
Mortgage, farmland	0	0	0
Mortgage, 1 to 4 family first liens	0	0	0
Mortgage, 1 to 4 family junior liens	0	0	0
Mortgage, multi-family	0	0	0
Mortgage, commercial	0	0	0
Loans to individuals	0	0	0
Total financial instrument assets	1,090,512	1,090,512	722,956
Observable Market Prices [Member]
Loans
Agricultural	0	0	0
Commercial and financial	0	0	0
Real Estate [Abstract]
Construction, land development and commercial	0	0	0
Mortgage, farmland	0	0	0
Mortgage, 1 to 4 family first liens	0	0	0
Mortgage, 1 to 4 family junior liens	0	0	0
Mortgage, multi-family	0	0	0
Mortgage, commercial	0	0	0
Loans to individuals	0	0	0
Total financial instrument assets	311,767	311,767	324,022
Company Determined Market Prices [Member]
Loans
Agricultural	92,185	92,185	92,922
Commercial and financial	223,726	223,726	282,015
Real Estate [Abstract]
Construction, land development and commercial	116,577	116,577	110,039
Mortgage, farmland	236,664	236,664	242,978
Mortgage, 1 to 4 family first liens	889,507	889,507	890,409
Mortgage, 1 to 4 family junior liens	112,320	112,320	124,945
Mortgage, multi-family	384,065	384,065	370,538
Mortgage, commercial	403,004	403,004	413,409
Loans to individuals	31,710	31,710	31,164
Total financial instrument assets	2,614,358	2,614,358	2,688,151
Nonrecurring Basis [Member]
Loans
Agricultural	886	886	1,081
Commercial and financial	1,188	1,188	1,692
Real Estate [Abstract]
Construction, 1 to 4 family residential	386	386	414
Construction, land development and commercial	96	96	315
Mortgage, farmland	1,217	1,217	1,718
Mortgage, 1 to 4 family first liens	5,084	5,084	5,906
Mortgage, 1 to 4 family junior liens	193	193	176
Mortgage, multi-family	1,470	1,470	1,773
Mortgage, commercial	4,222	4,222	5,082
Loans to individuals	0	0	0
Foreclosed assets	0	0	0
Total financial instrument assets	14,742	14,742	18,157
Total Losses	378	411	906
Nonrecurring Basis [Member] \| Agricultural [Member]
Real Estate [Abstract]
Total Losses	0	0	0
Nonrecurring Basis [Member] \| Commercial and Financial [Member]
Real Estate [Abstract]
Total Losses	0	0	385
Nonrecurring Basis [Member] \| Real Estate Construction One to Four Family Residential [Member]
Real Estate [Abstract]
Total Losses	0	0	0
Nonrecurring Basis [Member] \| Real Estate: Construction, land development and commercial [Member]
Real Estate [Abstract]
Total Losses	0	0	0
Nonrecurring Basis [Member] \| Real Estate: Mortgage, farmland [Member]
Real Estate [Abstract]
Total Losses	0	0	0
Nonrecurring Basis [Member] \| Real Estate: Mortgage, 1 to 4 family first liens [Member]
Real Estate [Abstract]
Total Losses	114	147	252
Nonrecurring Basis [Member] \| Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Real Estate [Abstract]
Total Losses	9	9	19
Nonrecurring Basis [Member] \| Real Estate: Mortgage, multi-family [Member]
Real Estate [Abstract]
Total Losses	0	0	0
Nonrecurring Basis [Member] \| Real Estate: Mortgage, commercial [Member]
Real Estate [Abstract]
Total Losses	255	255	250
Nonrecurring Basis [Member] \| Loans to individuals [Member]
Real Estate [Abstract]
Total Losses	0	0	0
Nonrecurring Basis [Member] \| Foreclosed assets [Member]
Real Estate [Abstract]
Total Losses	0	0	0
Nonrecurring Basis [Member] \| Readily Available Market Prices [Member]
Loans
Agricultural	0	0	0
Commercial and financial	0	0	0
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0	0
Construction, land development and commercial	0	0	0
Mortgage, farmland	0	0	0
Mortgage, 1 to 4 family first liens	0	0	0
Mortgage, 1 to 4 family junior liens	0	0	0
Mortgage, multi-family	0	0	0
Mortgage, commercial	0	0	0
Loans to individuals	0	0	0
Foreclosed assets	0	0	0
Total financial instrument assets	0	0	0
Nonrecurring Basis [Member] \| Observable Market Prices [Member]
Loans
Agricultural	0	0	0
Commercial and financial	0	0	0
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0	0
Construction, land development and commercial	0	0	0
Mortgage, farmland	0	0	0
Mortgage, 1 to 4 family first liens	0	0	0
Mortgage, 1 to 4 family junior liens	0	0	0
Mortgage, multi-family	0	0	0
Mortgage, commercial	0	0	0
Loans to individuals	0	0	0
Foreclosed assets	0	0	0
Total financial instrument assets	0	0	0
Nonrecurring Basis [Member] \| Company Determined Market Prices [Member]
Loans
Agricultural	886	886	1,081
Commercial and financial	1,188	1,188	1,692
Real Estate [Abstract]
Construction, 1 to 4 family residential	386	386	414
Construction, land development and commercial	96	96	315
Mortgage, farmland	1,217	1,217	1,718
Mortgage, 1 to 4 family first liens	5,084	5,084	5,906
Mortgage, 1 to 4 family junior liens	193	193	176
Mortgage, multi-family	1,470	1,470	1,773
Mortgage, commercial	4,222	4,222	5,082
Loans to individuals	0	0	0
Foreclosed assets	0	0	0
Total financial instrument assets	$ 14,742	$ 14,742	$ 18,157

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents agricultural loans held as presented on the statement of financial position which are due the Company as of the balance sheet date.

No definition available.