Fair Values - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Carrying Value
Cash and Cash Equivalents	$ 450,666	$ 70,221	$ 92,298	$ 84,239
Available-for-Sale at Fair Value	374,928	357,334	314,182
Securities Held-to-Maturity	224,799	245,065	255,095
Equity Securities	1,511	2,063	1,996
Net Loans	2,564,009	2,364,933	2,314,660
Deposits	3,264,858	2,616,054	2,614,547
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	73,949	51,099	72,869
Federal Home Loan Bank Overnight Advances	0	130,000	48,000
Federal Home Loan Bank Term Advances	50,000	30,000	30,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Fair Value
Available-for-Sale	374,928	357,334	314,182
Securities Held-to-Maturity	233,501	249,618	259,128
Equity Securities	1,511	2,063	1,996
Carrying Amount
Carrying Value
Cash and Cash Equivalents	450,666	70,221	92,298
Available-for-Sale at Fair Value	374,928	357,334	314,182
Securities Held-to-Maturity	224,799	245,065	255,095
Equity Securities	1,511	2,063	1,996
Federal Home Loan Bank and Federal Reserve Bank Stock	5,574	10,317	6,627
Net Loans	2,564,009	2,364,933	2,314,660
Accrued Interest Receivable	7,962	7,377	8,097
Derivatives, included in other assets	6,366	69	498
Deposits	3,264,858	2,616,054	2,614,547
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	73,949	51,099	72,869
Federal Home Loan Bank Overnight Advances		130,000	48,000
Federal Home Loan Bank Term Advances	50,000	30,000	30,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	841	1,436	1,500
Derivatives, included in other liabilities	6,366	69	498
Fair Value
Available-for-Sale	374,928	357,334	314,182
Equity Securities	1,511	2,063	1,996
Derivatives, included in other assets	6,366	69	498
Derivatives, included in other liabilities	6,366	69	498
Fair Value
Carrying Value
Available-for-Sale at Fair Value	374,928	357,334	314,182
Equity Securities	1,511	2,063	1,996
Derivatives, included in other assets	6,366	69	498
Derivatives, included in other liabilities	6,366	69	498
Fair Value
Cash and Cash Equivalents	450,666	70,221	92,298
Available-for-Sale	374,928	357,334	314,182
Securities Held-to-Maturity	233,501	249,618	259,128
Equity Securities	1,511	2,063	1,996
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	5,574	10,317	6,627
Net Loans, at Fair Value	2,560,043	2,332,797	2,274,701
Accrued Interest Receivable	7,962	7,377	8,097
Derivatives, included in other assets	6,366	69	498
Deposits	3,265,208	2,614,170	2,610,404
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	73,949	51,099	72,869
Federal Home Loan Bank Overnight Advances		130,000	48,000
Federal Home Loan Bank Term Advances	51,576	29,993	29,988
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	841	1,436	1,500
Derivatives, included in other liabilities	6,366	69	498
Quoted Prices In Active Markets for Indentical Assets (Level 1) | Fair Value
Carrying Value
Available-for-Sale at Fair Value	0	0	0
Equity Securities	0	0	0
Derivatives, included in other assets		0	0
Derivatives, included in other liabilities	0	0	0
Fair Value
Cash and Cash Equivalents	450,666	70,221	92,298
Available-for-Sale	0	0	0
Securities Held-to-Maturity	0	0	0
Equity Securities	0	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	0	0	0
Net Loans, at Fair Value	0	0	0
Accrued Interest Receivable	0	0	0
Derivatives, included in other assets		0	0
Deposits	0	0	0
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	0	0	0
Federal Home Loan Bank Overnight Advances		0	0
Federal Home Loan Bank Term Advances	0	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	0	0	0
Accrued Interest Payable	0	0	0
Derivatives, included in other liabilities	0	0	0
Significant Other Observable Inputs (Level 2) | Fair Value
Carrying Value
Available-for-Sale at Fair Value	374,928	357,334	314,182
Equity Securities	1,511	2,063	1,996
Derivatives, included in other assets	6,366	69	498
Derivatives, included in other liabilities	6,366	69	498
Fair Value
Cash and Cash Equivalents	0	0	0
Available-for-Sale	374,928	357,334	314,182
Securities Held-to-Maturity	233,501	249,618	259,128
Equity Securities	1,511	2,063	1,996
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	5,574	10,317	6,627
Net Loans, at Fair Value	0	0	0
Accrued Interest Receivable	7,962	7,377	8,097
Derivatives, included in other assets	6,366	69	498
Deposits	3,265,208	2,614,170	2,610,404
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	73,949	51,099	72,869
Federal Home Loan Bank Overnight Advances		130,000	48,000
Federal Home Loan Bank Term Advances	51,576	29,993	29,988
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	841	1,436	1,500
Derivatives, included in other liabilities	6,366	69	498
Significant Unobservable Inputs (Level 3) | Fair Value
Carrying Value
Available-for-Sale at Fair Value	0	0	0
Equity Securities	0
Derivatives, included in other assets		0	0
Derivatives, included in other liabilities	0	0	0
Fair Value
Cash and Cash Equivalents	0	0	0
Available-for-Sale	0	0	0
Securities Held-to-Maturity	0	0	0
Equity Securities	0
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	0	0	0
Net Loans, at Fair Value	2,560,043	2,332,797	2,274,701
Accrued Interest Receivable	0	0	0
Derivatives, included in other assets		0	0
Deposits	0	0	0
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	0	0	0
Federal Home Loan Bank Overnight Advances		0	0
Federal Home Loan Bank Term Advances	0	0	0
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	0	0	0
Accrued Interest Payable	0	0	0
Derivatives, included in other liabilities	$ 0	$ 0	$ 0