Loans and Leases - Credit Quality Indicators (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	$ 5,661,777,000	$ 5,310,017,000	$ 5,327,313,000
2022	732,609,000	1,350,136,000
2021	1,200,462,000	1,123,997,000
2020	990,636,000	600,884,000
2019	490,563,000	275,201,000
2018	239,090,000	250,626,000
Prior	387,194,000	259,386,000
Revolving loans amortized cost basis	602,545,000	540,267,000
Total	4,643,099,000	4,400,497,000
Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	178,267,000	305,178,000
2021	287,866,000	216,186,000
2020	194,579,000	63,599,000
2019	49,926,000	40,335,000
2018	31,309,000	24,920,000
Prior	88,961,000	82,679,000
Revolving loans amortized cost basis	184,688,000	173,615,000
Total	1,015,596,000	906,512,000
Nonperforming Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	13,000	53,000
2021	239,000	648,000
2020	643,000	64,000
2019	21,000	602,000
2018	536,000	7,000
Prior	1,298,000	1,271,000
Revolving loans amortized cost basis	332,000	363,000
Total	3,082,000	3,008,000
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	723,608,000	1,341,674,000
2021	1,169,728,000	1,083,293,000
2020	977,894,000	568,124,000
2019	456,890,000	252,767,000
2018	206,957,000	248,059,000
Prior	379,144,000	248,348,000
Revolving loans amortized cost basis	567,054,000	524,749,000
Total	4,481,275,000	4,267,014,000
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,001,000	8,462,000
2021	30,734,000	18,649,000
2020	10,930,000	29,355,000
2019	30,174,000	20,394,000
2018	28,759,000	1,417,000
Prior	6,278,000	7,954,000
Revolving loans amortized cost basis	30,479,000	10,260,000
Total	146,355,000	96,491,000
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	22,055,000
2020	1,812,000	3,405,000
2019	3,499,000	2,040,000
2018	3,374,000	1,150,000
Prior	1,772,000	3,084,000
Revolving loans amortized cost basis	5,012,000	5,258,000
Total	15,469,000	36,992,000
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	0
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	1,028,354,000	956,396,000	920,621,000
2022	122,656,000	216,198,000
2021	189,313,000	83,198,000
2020	62,286,000	72,007,000
2019	41,668,000	52,901,000
2018	39,798,000	23,697,000
Prior	60,997,000	51,258,000
Revolving loans amortized cost basis	511,636,000	457,137,000
Total	1,028,354,000	956,396,000
Commercial Financial And Agricultural [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	114,553,000	215,197,000
2021	187,158,000	79,739,000
2020	59,200,000	69,618,000
2019	33,100,000	52,507,000
2018	39,711,000	23,253,000
Prior	60,763,000	49,827,000
Revolving loans amortized cost basis	478,196,000	442,288,000
Total	972,681,000	932,429,000
Commercial Financial And Agricultural [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	8,103,000	1,001,000
2021	2,155,000	3,459,000
2020	3,086,000	2,389,000
2019	8,568,000	394,000
2018	87,000	428,000
Prior	34,000	1,231,000
Revolving loans amortized cost basis	28,577,000	10,162,000
Total	50,610,000	19,064,000
Commercial Financial And Agricultural [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	16,000
Prior	200,000	200,000
Revolving loans amortized cost basis	4,863,000	4,687,000
Total	5,063,000	4,903,000
Real-Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	2,870,286,000	2,718,535,000	2,600,919,000
2022	460,918,000	805,445,000
2021	738,891,000	894,819,000
2020	821,115,000	434,483,000
2019	364,668,000	157,887,000
2018	150,845,000	197,782,000
Prior	286,880,000	179,667,000
Revolving loans amortized cost basis	46,969,000	48,452,000
Total	2,870,286,000	2,718,535,000
Real-Estate Commercial [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	460,020,000	802,878,000
2021	736,374,000	858,426,000
2020	812,237,000	407,944,000
2019	345,087,000	155,892,000
2018	138,842,000	195,756,000
Prior	280,762,000	172,702,000
Revolving loans amortized cost basis	45,067,000	48,354,000
Total	2,818,389,000	2,641,952,000
Real-Estate Commercial [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	898,000	2,567,000
2021	2,517,000	14,338,000
2020	7,093,000	23,134,000
2019	16,082,000	0
2018	8,672,000	916,000
Prior	5,290,000	5,630,000
Revolving loans amortized cost basis	1,902,000	98,000
Total	42,454,000	46,683,000
Real-Estate Commercial [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	22,055,000
2020	1,785,000	3,405,000
2019	3,499,000	1,995,000
2018	3,331,000	1,110,000
Prior	828,000	1,335,000
Revolving loans amortized cost basis	0	0
Total	9,443,000	29,900,000
Real-Estate Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	319,449,000	283,918,000	274,529,000
2022	79,406,000	142,306,000
2021	131,669,000	60,452,000
2020	31,766,000	42,424,000
2019	41,417,000	29,995,000
2018	20,000,000	198,000
Prior	273,000	0
Revolving loans amortized cost basis	14,918,000	8,543,000
Total	319,449,000	283,918,000
Real-Estate Construction [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	79,406,000	137,622,000
2021	105,607,000	59,952,000
2020	31,266,000	38,592,000
2019	35,893,000	9,995,000
2018	0	198,000
Prior	273,000	0
Revolving loans amortized cost basis	14,918,000	8,543,000
Total	267,363,000	254,902,000
Real-Estate Construction [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	4,684,000
2021	26,062,000	500,000
2020	500,000	3,832,000
2019	5,524,000	20,000,000
2018	20,000,000	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Total	52,086,000	29,016,000
Real-Estate Construction [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Total	0	0
Real Estate Residential Secured For Business Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	419,652,000	409,900,000	407,664,000
2022	69,306,000	154,633,000
2021	135,554,000	85,334,000
2020	75,469,000	51,970,000
2019	42,810,000	34,418,000
2018	28,447,000	28,949,000
Prior	39,044,000	28,461,000
Revolving loans amortized cost basis	29,022,000	26,135,000
Total	419,652,000	409,900,000
Real Estate Residential Secured For Business Purpose [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	69,306,000	154,423,000
2021	135,554,000	84,982,000
2020	75,191,000	51,970,000
2019	42,810,000	34,373,000
2018	28,404,000	28,852,000
Prior	37,346,000	25,819,000
Revolving loans amortized cost basis	28,873,000	25,564,000
Total	417,484,000	405,983,000
Real Estate Residential Secured For Business Purpose [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	210,000
2021	0	352,000
2020	251,000	0
2019	0	0
2018	0	73,000
Prior	954,000	1,093,000
Revolving loans amortized cost basis	0	0
Total	1,205,000	1,728,000
Real Estate Residential Secured For Business Purpose [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	27,000	0
2019	0	45,000
2018	43,000	24,000
Prior	744,000	1,549,000
Revolving loans amortized cost basis	149,000	571,000
Total	963,000	2,189,000
Real Estate-Residential Secured For Personal Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	629,144,000	540,566,000	513,330,000
2022	132,388,000	219,733,000
2021	213,176,000	163,243,000
2020	151,028,000	34,102,000
2019	27,132,000	23,436,000
2018	20,520,000	19,912,000
Prior	84,872,000	79,951,000
Revolving loans amortized cost basis	28,000	189,000
Total	629,144,000	540,566,000
Real Estate-Residential Secured For Personal Purpose [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	132,388,000	219,680,000
2021	213,125,000	162,609,000
2020	150,423,000	34,102,000
2019	27,132,000	23,065,000
2018	20,179,000	19,912,000
Prior	83,667,000	78,960,000
Revolving loans amortized cost basis	28,000	189,000
Total	626,942,000	538,517,000
Real Estate-Residential Secured For Personal Purpose [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	53,000
2021	51,000	634,000
2020	605,000	0
2019	0	371,000
2018	341,000	0
Prior	1,205,000	991,000
Revolving loans amortized cost basis	0	0
Total	2,202,000	2,049,000
Real Estate Home Equity Secured For Personal Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	168,536,000	158,909,000	160,018,000
2022	1,599,000	961,000
2021	836,000	876,000
2020	635,000	370,000
2019	231,000	588,000
2018	464,000	704,000
Prior	1,899,000	1,715,000
Revolving loans amortized cost basis	162,872,000	153,695,000
Total	168,536,000	158,909,000
Real Estate Home Equity Secured For Personal Purpose [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,599,000	961,000
2021	836,000	876,000
2020	635,000	370,000
2019	231,000	415,000
2018	295,000	704,000
Prior	1,893,000	1,655,000
Revolving loans amortized cost basis	162,564,000	153,332,000
Total	168,053,000	158,313,000
Real Estate Home Equity Secured For Personal Purpose [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	173,000
2018	169,000	0
Prior	6,000	60,000
Revolving loans amortized cost basis	308,000	363,000
Total	483,000	596,000
Loans to Individuals [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	27,061,000	25,504,000	25,845,000
2022	893,000	1,376,000
2021	1,053,000	893,000
2020	711,000	722,000
2019	441,000	466,000
2018	268,000	100,000
Prior	1,575,000	1,853,000
Revolving loans amortized cost basis	22,120,000	20,094,000
Total	27,061,000	25,504,000
Loans to Individuals [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	893,000	1,376,000
2021	1,053,000	893,000
2020	711,000	722,000
2019	441,000	466,000
2018	268,000	100,000
Prior	1,509,000	1,673,000
Revolving loans amortized cost basis	22,096,000	20,094,000
Total	26,971,000	25,324,000
Loans to Individuals [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	66,000	180,000
Revolving loans amortized cost basis	24,000	0
Total	90,000	180,000
Lease Financings [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	193,937,000	184,541,000	$ 171,538,000
2022	43,400,000	83,161,000
2021	73,040,000	51,822,000
2020	42,848,000	28,469,000
2019	22,143,000	16,447,000
2018	10,593,000	4,211,000
Prior	1,913,000	431,000
Revolving loans amortized cost basis	0	0
Total	193,937,000	184,541,000
Lease Financings [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	43,387,000	83,161,000
2021	72,852,000	51,808,000
2020	42,810,000	28,405,000
2019	22,122,000	16,389,000
2018	10,567,000	4,204,000
Prior	1,892,000	391,000
Revolving loans amortized cost basis	0	0
Total	193,630,000	184,358,000
Lease Financings [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	13,000	0
2021	188,000	14,000
2020	38,000	64,000
2019	21,000	58,000
2018	26,000	7,000
Prior	21,000	40,000
Revolving loans amortized cost basis	0	0
Total	307,000	183,000
Financing Receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	178,280,000	305,231,000
2021	288,105,000	216,834,000
2020	195,222,000	63,663,000
2019	49,947,000	40,937,000
2018	31,845,000	24,927,000
Prior	90,259,000	83,950,000
Revolving loans amortized cost basis	185,020,000	173,978,000
Total	$ 1,018,678,000	$ 909,520,000