Fair Values - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Carrying Value
Cash and Cash Equivalents	$ 598,366	$ 380,991	$ 450,666	$ 70,221
Securities Available-for-Sale	486,900	365,287	374,928
Held-To-Maturity Securities, at Amortized Cost	198,337	218,405	224,799
Equity Securities	1,886	1,636	1,511
Net Loans	2,627,795	2,565,798	2,564,009
Deposits	3,605,563	3,234,726	3,264,858
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	2,426	17,486	73,949
Federal Home Loan Bank Term Advances	45,000	45,000	50,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Fair Value
Securities Available-for-Sale	486,900	365,287	374,928
Securities Held-to-Maturity	203,936	226,576	233,501
Equity Securities	1,886	1,636	1,511
Carrying Amount
Carrying Value
Cash and Cash Equivalents	598,366	380,991	450,666
Securities Available-for-Sale	486,900	365,287	374,928
Held-To-Maturity Securities, at Amortized Cost	198,337	218,405	224,799
Equity Securities	1,886	1,636	1,511
Federal Home Loan Bank and Federal Reserve Bank Stock	5,380	5,349	5,574
Net Loans	2,627,795	2,565,798	2,564,009
Accrued Interest Receivable	7,899	7,495	7,962
Derivatives, included in other assets	2,287	5,080	6,366
Deposits	3,605,563	3,234,726	3,264,858
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	2,426	17,486	73,949
Federal Home Loan Bank Overnight Advances		45,000
Federal Home Loan Bank Term Advances	45,000		50,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	137	326	841
Derivatives, included in other liabilities	2,287	5,080	6,366
Fair Value
Securities Available-for-Sale	486,900	365,287	374,928
Equity Securities	1,886	1,636	1,511
Derivatives, included in other assets	2,287	5,080	6,366
Derivatives, included in other liabilities	2,287	5,080	6,366
Fair Value
Carrying Value
Securities Available-for-Sale	486,900	365,287	374,928
Equity Securities	1,886	1,636	1,511
Derivatives, included in other assets	2,287	5,080	6,366
Derivatives, included in other liabilities	2,287	5,080	6,366
Fair Value
Cash and Cash Equivalents	598,366	380,991	450,666
Securities Available-for-Sale	486,900	365,287	374,928
Securities Held-to-Maturity	203,936	226,576	233,501
Equity Securities	1,886	1,636	1,511
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	5,380	5,349	5,574
Net Loans	2,632,843	2,558,903	2,560,043
Accrued Interest Receivable	7,899	7,495	7,962
Derivatives, included in other assets	2,287	5,080	6,366
Deposits	3,604,271	3,234,387	3,265,208
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	2,426	17,486	73,949
Federal Home Loan Bank Overnight Advances		46,474
Federal Home Loan Bank Term Advances	45,906		51,576
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	137	326	841
Derivatives, included in other liabilities	2,287	5,080	6,366
Quoted Prices In Active Markets for Indentical Assets (Level 1) | Fair Value
Carrying Value
Securities Available-for-Sale	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	598,366	380,991	450,666
Securities 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	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
Federal Home Loan Bank Term Advances	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
Securities Available-for-Sale	486,900	365,287	374,928
Equity Securities	1,886	1,636	1,511
Derivatives, included in other assets	2,287	5,080	6,366
Derivatives, included in other liabilities	2,287	5,080	6,366
Fair Value
Cash and Cash Equivalents	0	0	0
Securities Available-for-Sale	486,900	365,287	374,928
Securities Held-to-Maturity	203,936	226,576	233,501
Equity Securities	1,886	1,636	1,511
Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value	5,380	5,349	5,574
Net Loans	0	0	0
Accrued Interest Receivable	7,899	7,495	7,962
Derivatives, included in other assets	2,287	5,080	6,366
Deposits	3,604,271	3,234,387	3,265,208
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	2,426	17,486	73,949
Federal Home Loan Bank Overnight Advances		46,474
Federal Home Loan Bank Term Advances	45,906		51,576
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	20,000
Accrued Interest Payable	137	326	841
Derivatives, included in other liabilities	2,287	5,080	6,366
Significant Unobservable Inputs (Level 3) | Fair Value
Carrying Value
Securities Available-for-Sale	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
Securities 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	2,632,843	2,558,903	2,560,043
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
Federal Home Loan Bank Term Advances	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