Loans and Leases - Credit Quality Indicators (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	$ 5,400,786,000	$ 5,310,017,000	$ 5,415,006,000
2022	339,360,000	1,350,136,000
2021	1,273,844,000	1,123,997,000
2020	1,063,127,000	600,884,000
2019	544,629,000	275,201,000
2018	253,776,000	250,626,000
Prior	447,234,000	259,386,000
Revolving loans amortized cost basis	535,119,000	540,267,000
Total	4,457,089,000	4,400,497,000
Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	76,270,000	305,178,000
2021	296,490,000	216,186,000
2020	204,407,000	63,599,000
2019	55,484,000	40,335,000
2018	34,651,000	24,920,000
Prior	96,984,000	82,679,000
Revolving loans amortized cost basis	176,189,000	173,615,000
Total	940,475,000	906,512,000
Nonperforming Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	53,000
2021	214,000	648,000
2020	635,000	64,000
2019	35,000	602,000
2018	559,000	7,000
Prior	1,467,000	1,271,000
Revolving loans amortized cost basis	312,000	363,000
Total	3,222,000	3,008,000
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	338,448,000	1,341,674,000
2021	1,245,162,000	1,083,293,000
2020	1,030,066,000	568,124,000
2019	511,428,000	252,767,000
2018	219,167,000	248,059,000
Prior	437,066,000	248,348,000
Revolving loans amortized cost basis	513,465,000	524,749,000
Total	4,294,802,000	4,267,014,000
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	912,000	8,462,000
2021	28,682,000	18,649,000
2020	10,974,000	29,355,000
2019	29,702,000	20,394,000
2018	34,329,000	1,417,000
Prior	7,788,000	7,954,000
Revolving loans amortized cost basis	16,638,000	10,260,000
Total	129,025,000	96,491,000
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	22,055,000
2020	22,087,000	3,405,000
2019	3,499,000	2,040,000
2018	280,000	1,150,000
Prior	2,380,000	3,084,000
Revolving loans amortized cost basis	5,016,000	5,258,000
Total	33,262,000	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	932,485,000	956,396,000	871,996,000
2022	61,928,000	216,198,000
2021	192,119,000	83,198,000
2020	70,536,000	72,007,000
2019	45,276,000	52,901,000
2018	47,399,000	23,697,000
Prior	65,246,000	51,258,000
Revolving loans amortized cost basis	449,981,000	457,137,000
Total	932,485,000	956,396,000
Commercial Financial And Agricultural [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	61,928,000	215,197,000
2021	189,868,000	79,739,000
2020	66,196,000	69,618,000
2019	43,083,000	52,507,000
2018	41,794,000	23,253,000
Prior	63,584,000	49,827,000
Revolving loans amortized cost basis	428,551,000	442,288,000
Total	895,004,000	932,429,000
Commercial Financial And Agricultural [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	1,001,000
2021	2,251,000	3,459,000
2020	4,340,000	2,389,000
2019	2,193,000	394,000
2018	5,605,000	428,000
Prior	1,462,000	1,231,000
Revolving loans amortized cost basis	16,565,000	10,162,000
Total	32,416,000	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	4,865,000	4,687,000
Total	5,065,000	4,903,000
Real-Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	2,816,737,000	2,718,535,000	2,531,700,000
2022	218,701,000	805,445,000
2021	784,194,000	894,819,000
2020	868,387,000	434,483,000
2019	411,661,000	157,887,000
2018	154,877,000	197,782,000
Prior	332,930,000	179,667,000
Revolving loans amortized cost basis	45,987,000	48,452,000
Total	2,816,737,000	2,718,535,000
Real-Estate Commercial [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	217,789,000	802,878,000
2021	781,652,000	858,426,000
2020	840,423,000	407,944,000
2019	385,224,000	155,892,000
2018	145,916,000	195,756,000
Prior	326,313,000	172,702,000
Revolving loans amortized cost basis	45,914,000	48,354,000
Total	2,743,231,000	2,641,952,000
Real-Estate Commercial [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	912,000	2,567,000
2021	2,542,000	14,338,000
2020	5,877,000	23,134,000
2019	22,938,000	0
2018	8,724,000	916,000
Prior	5,366,000	5,630,000
Revolving loans amortized cost basis	73,000	98,000
Total	46,432,000	46,683,000
Real-Estate Commercial [Member] | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	22,055,000
2020	22,087,000	3,405,000
2019	3,499,000	1,995,000
2018	237,000	1,110,000
Prior	1,251,000	1,335,000
Revolving loans amortized cost basis	0	0
Total	27,074,000	29,900,000
Real-Estate Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	285,083,000	283,918,000	249,652,000
2022	27,984,000	142,306,000
2021	143,949,000	60,452,000
2020	42,827,000	42,424,000
2019	40,137,000	29,995,000
2018	20,000,000	198,000
Prior	273,000	0
Revolving loans amortized cost basis	9,913,000	8,543,000
Total	285,083,000	283,918,000
Real-Estate Construction [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	27,984,000	137,622,000
2021	120,060,000	59,952,000
2020	42,327,000	38,592,000
2019	35,566,000	9,995,000
2018	0	198,000
Prior	273,000	0
Revolving loans amortized cost basis	9,913,000	8,543,000
Total	236,123,000	254,902,000
Real-Estate Construction [Member] | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	4,684,000
2021	23,889,000	500,000
2020	500,000	3,832,000
2019	4,571,000	20,000,000
2018	20,000,000	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Total	48,960,000	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	412,486,000	409,900,000	387,801,000
2022	30,735,000	154,633,000
2021	143,361,000	85,334,000
2020	81,312,000	51,970,000
2019	47,555,000	34,418,000
2018	31,500,000	28,949,000
Prior	48,785,000	28,461,000
Revolving loans amortized cost basis	29,238,000	26,135,000
Total	412,486,000	409,900,000
Real Estate Residential Secured For Business Purpose [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	30,735,000	154,423,000
2021	143,361,000	84,982,000
2020	81,059,000	51,970,000
2019	47,555,000	34,373,000
2018	31,457,000	28,852,000
Prior	46,896,000	25,819,000
Revolving loans amortized cost basis	29,087,000	25,564,000
Total	410,150,000	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	253,000	0
2019	0	0
2018	0	73,000
Prior	960,000	1,093,000
Revolving loans amortized cost basis	0	0
Total	1,213,000	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	0	0
2019	0	45,000
2018	43,000	24,000
Prior	929,000	1,549,000
Revolving loans amortized cost basis	151,000	571,000
Total	1,123,000	2,189,000
Real Estate-Residential Secured For Personal Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	568,735,000	540,566,000	494,349,000
2022	54,140,000	219,733,000
2021	216,100,000	163,243,000
2020	156,648,000	34,102,000
2019	29,247,000	23,436,000
2018	21,000,000	19,912,000
Prior	91,536,000	79,951,000
Revolving loans amortized cost basis	64,000	189,000
Total	568,735,000	540,566,000
Real Estate-Residential Secured For Personal Purpose [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	54,140,000	219,680,000
2021	216,048,000	162,609,000
2020	156,027,000	34,102,000
2019	29,247,000	23,065,000
2018	20,629,000	19,912,000
Prior	90,321,000	78,960,000
Revolving loans amortized cost basis	64,000	189,000
Total	566,476,000	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	52,000	634,000
2020	621,000	0
2019	0	371,000
2018	371,000	0
Prior	1,215,000	991,000
Revolving loans amortized cost basis	0	0
Total	2,259,000	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	160,134,000	158,909,000	162,529,000
2022	302,000	961,000
2021	943,000	876,000
2020	665,000	370,000
2019	359,000	588,000
2018	511,000	704,000
Prior	2,143,000	1,715,000
Revolving loans amortized cost basis	155,211,000	153,695,000
Total	160,134,000	158,909,000
Real Estate Home Equity Secured For Personal Purpose [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	302,000	961,000
2021	943,000	876,000
2020	665,000	370,000
2019	359,000	415,000
2018	340,000	704,000
Prior	2,086,000	1,655,000
Revolving loans amortized cost basis	154,899,000	153,332,000
Total	159,594,000	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	171,000	0
Prior	57,000	60,000
Revolving loans amortized cost basis	312,000	363,000
Total	540,000	596,000
Loans to Individuals [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	26,249,000	25,504,000	25,468,000
2022	387,000	1,376,000
2021	1,169,000	893,000
2020	785,000	722,000
2019	560,000	466,000
2018	368,000	100,000
Prior	1,754,000	1,853,000
Revolving loans amortized cost basis	21,226,000	20,094,000
Total	26,249,000	25,504,000
Loans to Individuals [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	387,000	1,376,000
2021	1,169,000	893,000
2020	785,000	722,000
2019	560,000	466,000
2018	368,000	100,000
Prior	1,569,000	1,673,000
Revolving loans amortized cost basis	21,226,000	20,094,000
Total	26,064,000	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	185,000	180,000
Revolving loans amortized cost basis	0	0
Total	185,000	180,000
Lease Financings [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	188,579,000	184,541,000	$ 163,059,000
2022	21,441,000	83,161,000
2021	78,492,000	51,822,000
2020	46,944,000	28,469,000
2019	25,353,000	16,447,000
2018	13,331,000	4,211,000
Prior	3,018,000	431,000
Revolving loans amortized cost basis	0	0
Total	188,579,000	184,541,000
Lease Financings [Member] | Performing Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	21,441,000	83,161,000
2021	78,330,000	51,808,000
2020	46,930,000	28,405,000
2019	25,318,000	16,389,000
2018	13,314,000	4,204,000
Prior	3,008,000	391,000
Revolving loans amortized cost basis	0	0
Total	188,341,000	184,358,000
Lease Financings [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	162,000	14,000
2020	14,000	64,000
2019	35,000	58,000
2018	17,000	7,000
Prior	10,000	40,000
Revolving loans amortized cost basis	0	0
Total	238,000	183,000
Financing Receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	76,270,000	305,231,000
2021	296,704,000	216,834,000
2020	205,042,000	63,663,000
2019	55,519,000	40,937,000
2018	35,210,000	24,927,000
Prior	98,451,000	83,950,000
Revolving loans amortized cost basis	176,501,000	173,978,000
Total	$ 943,697,000	$ 909,520,000