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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	$ 2,695	$ 2,420	$ 1,071	$ 2,695	$ 1,071	$ 2,420
With a specific allowance recorded, Recorded Investment	9,872	641	1,105	9,872	1,105	641
Related Allowance	1,170	197	235	1,170	235	197
Recorded Investment	12,567	3,061	2,176	12,567	2,176	3,061
Average Recorded Investment	8,352	3,120	2,201	6,333	2,168	2,649
Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	787	648	643	787	643	648
With no related allowance recorded, Unpaid Principal Balance	787	648	643	787	643	648
With no related allowance recorded, Average Recorded Investment	624		644	637	624	626
With no related allowance recorded, Interest Income Recognized	4		8	8	15	32
With no related allowance recorded, Interest Income Recognized Cash Basis			3	3	4	9
With a specific allowance recorded, Recorded Investment	60	181	219	60	219	181
With a specific allowance recorded, Unpaid Principal Balance	60	184	219	60	219	184
Related Allowance	16	30	54	16	54	30
With a specific allowance recorded, Average Recorded Investment	194		235	203	244	211
With a specific allowance recorded, Interest Income Recognized	1			3
With a specific allowance recorded, Interest Income Recognized Cash Basis	1			1
Recorded Investment	847	829	862	847	862	829
Unpaid Principal Balance	847	832	862	847	862	832
Average Recorded Investment	818		879	840	868	837
Interest Income Recognized	5		8	11	15	32
Interest Income Recognized Cash Basis	1		3	4	4	9
Agricultural Real Estate [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	521			521
With no related allowance recorded, Unpaid Principal Balance	521			521
With no related allowance recorded, Average Recorded Investment	187			239		204
With no related allowance recorded, Interest Income Recognized	5			7
With a specific allowance recorded, Recorded Investment	5,469			5,469
With a specific allowance recorded, Unpaid Principal Balance	5,469			5,469
Related Allowance	438			438
With a specific allowance recorded, Average Recorded Investment	1,884			988		22
With a specific allowance recorded, Interest Income Recognized	1			3		1
Recorded Investment	5,990			5,990
Unpaid Principal Balance	5,990			5,990
Average Recorded Investment	2,071			1,227		226
Interest Income Recognized	6			10		1
Agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	383	491		383		491
With no related allowance recorded, Unpaid Principal Balance	383	491		383		491
With no related allowance recorded, Average Recorded Investment	340			363		124
With no related allowance recorded, Interest Income Recognized	4			8
With a specific allowance recorded, Recorded Investment	240	200	74	240	74	200
With a specific allowance recorded, Unpaid Principal Balance	240	200	74	240	74	200
Related Allowance	98	21	26	98	26	21
With a specific allowance recorded, Average Recorded Investment	161		74	141	37	29
With a specific allowance recorded, Interest Income Recognized	9
Recorded Investment	623	691	74	623	74	691
Unpaid Principal Balance	623	691	74	623	74	691
Average Recorded Investment	501		74	504	37	153
Interest Income Recognized	13			8
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	186	299	191	186	191	299
With no related allowance recorded, Unpaid Principal Balance	186	299	191	186	191	299
With no related allowance recorded, Average Recorded Investment	186		191	205	192	238
With no related allowance recorded, Interest Income Recognized			3	4	7	19
With a specific allowance recorded, Recorded Investment	3,072			3,072
With a specific allowance recorded, Unpaid Principal Balance	3,072			3,072
Related Allowance	58			58
With a specific allowance recorded, Average Recorded Investment	3,085			2,061
With a specific allowance recorded, Interest Income Recognized	39			78
Recorded Investment	3,258	299	191	3,258	191	299
Unpaid Principal Balance	3,258	299	191	3,258	191	299
Average Recorded Investment	3,271		191	2,266	192	238
Interest Income Recognized	39		3	82	7	19
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	791	982	237	791	237	982
With no related allowance recorded, Unpaid Principal Balance	791	982	237	791	237	982
With no related allowance recorded, Average Recorded Investment	568		787	633	936	637
With no related allowance recorded, Interest Income Recognized	4		3	6	6	66
With a specific allowance recorded, Recorded Investment	1,031	227	812	1,031	812	227
With a specific allowance recorded, Unpaid Principal Balance	1,031	377	812	1,031	812	377
Related Allowance	560	142	155	560	155	142
With a specific allowance recorded, Average Recorded Investment	1,095		270	834	135	555
With a specific allowance recorded, Interest Income Recognized	11		12	27	23
Recorded Investment	1,822	1,209	1,049	1,822	1,049	1,209
Unpaid Principal Balance	1,822	1,359	1,049	1,822	1,049	1,359
Average Recorded Investment	1,663		1,057	1,467	1,071	1,192
Interest Income Recognized	15		$ 15	33	$ 29	66
Consumer [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded Investment	27			27
With no related allowance recorded, Unpaid Principal Balance	27			27
With no related allowance recorded, Average Recorded Investment	28			19
With no related allowance recorded, Interest Income Recognized				1
With a specific allowance recorded, Recorded Investment		33				33
With a specific allowance recorded, Unpaid Principal Balance		33				33
Related Allowance		4				4
With a specific allowance recorded, Average Recorded Investment				10		3
Recorded Investment	27	33		27		33
Unpaid Principal Balance	27	$ 33		27		33
Average Recorded Investment	$ 28			29		$ 3
Interest Income Recognized				$ 1

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