Disclosures about Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial Assets
Available-for-sale securities	$ 733,024	$ 739,473
Restricted equity securities	18,539	17,278
Derivative assets	28,041	9,838
Financial Liabilities
Derivative liabilities	28,139	9,907
Carrying Amount
Financial Assets
Cash and cash equivalents	158,987	187,320
Available-for-sale securities	735,231	741,634
Loans, net of allowance for loan losses	3,950,993	3,795,348
Restricted equity securities	18,539	17,278
Interest receivable	16,958	15,716
Derivative assets	28,041	9,838
Total financial assets	4,908,749	4,767,134
Financial Liabilities
Deposits	3,972,822	3,923,759
Federal funds purchased and repurchase agreements	38,946	14,921
Federal Home Loan Bank advances	402,680	358,743
Other borrowings	931	921
Interest payable	3,365	4,584
Derivative liabilities	28,139	9,907
Total financial liabilities	4,446,883	4,312,835
Estimate of Fair Value Measurement
Financial Assets
Cash and cash equivalents	158,987	187,320
Available-for-sale securities	735,231	741,634
Loans, net of allowance for loan losses	3,946,203	3,810,818
Restricted equity securities	18,539	17,278
Interest receivable	16,958	15,716
Derivative assets	28,041	9,838
Total financial assets	4,903,959	4,782,604
Financial Liabilities
Deposits	3,995,393	3,928,838
Federal funds purchased and repurchase agreements	38,946	14,921
Federal Home Loan Bank advances	423,799	357,859
Other borrowings	1,576	2,147
Interest payable	3,365	4,584
Derivative liabilities	28,139	9,907
Total financial liabilities	4,491,218	4,318,256
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Cash and cash equivalents	158,987	187,320
Available-for-sale securities	0	0
Loans, net of allowance for loan losses	0	0
Restricted equity securities	0	0
Interest receivable	0	0
Derivative assets	0	0
Total financial assets	158,987	187,320
Financial Liabilities
Deposits	567,215	521,826
Federal funds purchased and repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Interest payable	0	0
Derivative liabilities	0	0
Total financial liabilities	567,215	521,826
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Financial Assets
Cash and cash equivalents	0	0
Available-for-sale securities	735,231	741,634
Loans, net of allowance for loan losses	0	0
Restricted equity securities	0	0
Interest receivable	16,958	15,716
Derivative assets	28,041	9,838
Total financial assets	780,230	767,188
Financial Liabilities
Deposits	0	0
Federal funds purchased and repurchase agreements	38,946	14,921
Federal Home Loan Bank advances	423,799	357,859
Other borrowings	1,576	2,147
Interest payable	3,365	4,584
Derivative liabilities	28,139	9,907
Total financial liabilities	495,825	389,418
Estimate of Fair Value Measurement | Unobservable Inputs (Level 3)
Financial Assets
Cash and cash equivalents	0	0
Available-for-sale securities	0	0
Loans, net of allowance for loan losses	3,946,203	3,810,818
Restricted equity securities	18,539	17,278
Interest receivable	0	0
Derivative assets	0	0
Total financial assets	3,964,742	3,828,096
Financial Liabilities
Deposits	3,428,178	3,407,012
Federal funds purchased and repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Interest payable	0	0
Derivative liabilities	0	0
Total financial liabilities	$ 3,428,178	$ 3,407,012