Fair Value Measurements (Estimated Fair Values of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial assets, Estimated Fair Value
Investment securities held to maturity	$ 197,991	$ 65,828
Fair Value, Inputs, Level 1 [Member] | Carrying Amount [Member]
Financial assets, Estimated Fair Value
Cash and cash equivalents	237,188	186,917
Fair Value, Inputs, Level 1 [Member] | Estimated Fair Value [Member]
Financial assets, Estimated Fair Value
Cash and cash equivalents	237,188	186,917
Fair Value, Inputs, Level 2 [Member] | Carrying Amount [Member]
Financial assets, Estimated Fair Value
Investment securities held to maturity	198,884	65,706
Restricted securities	3,189	3,626
Cash surrender value on life insurance	41,672	31,018
Financial liabilities, Estimated Fair Value
Noninterest-bearing demand	538,009	509,091
Checking plus interest	443,919	446,243
Money market	406,009	292,974
Savings	215,063	177,524
Club	1,138	392
Certificates of deposit, $100,000 or more	134,670	129,623
Other time	141,774	144,858
Securities sold under retail repurchase agreement	2,907	1,050
Subordinated debt	24,490	24,429
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value [Member]
Financial assets, Estimated Fair Value
Investment securities held to maturity	197,991	65,828
Restricted securities	3,189	3,626
Cash surrender value on life insurance	41,672	31,018
Financial liabilities, Estimated Fair Value
Noninterest-bearing demand	538,009	509,091
Checking plus interest	443,919	446,243
Money market	406,009	292,974
Savings	215,063	177,524
Club	1,138	392
Certificates of deposit, $100,000 or more	136,059	131,271
Other time	142,534	146,137
Securities sold under retail repurchase agreement	2,907	1,050
Subordinated debt	26,871	25,745
Fair Value, Inputs, Level 3 [Member] | Carrying Amount [Member]
Financial assets, Estimated Fair Value
Loans, net	1,457,341	1,440,368
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value [Member]
Financial assets, Estimated Fair Value
Loans, net	$ 1,458,057	$ 1,436,292