Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) Segment	Sep. 30, 2025 USD ($) Segment	Sep. 30, 2024 USD ($) Segment	Dec. 31, 2024 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment		1	2	1
Financial Information of Reportable Segments [Abstract]
Net interest income	$ 134,663	$ 101,669	$ 366,106	$ 294,017
Provision for loan losses	3,100	2,920	28,489	17,398
Net interest income after provision for loan losses	131,563	98,749	337,617	276,619
Noninterest income [Abstract]
Service charges on deposit accounts	5,100	4,340	13,921	12,676
Card services income	6,389	5,897	17,783	16,679
Retirement plan administration fees	15,913	14,578	47,481	43,663
Wealth management	11,103	10,929	32,727	30,799
Insurance services	5,260	4,913	14,118	13,149
Bank owned life insurance income	3,240	1,868	8,817	6,054
Net securities (losses) gains	(2)	476	6	2,567
Other	4,402	2,773	10,936	8,811
Total noninterest income	51,405	45,774	145,789	134,398
Noninterest expense [Abstract]
Salaries and employee benefits	66,636	59,641	191,485	170,738
Technology and data services	11,180	9,920	32,222	28,919
Occupancy	9,053	7,754	27,118	23,523
Professional fees and outside services	5,941	4,871	15,914	14,289
Office supplies and postage	2,073	1,756	5,886	5,425
FDIC assessment	2,262	1,815	5,776	5,217
Advertising	833	711	2,945	2,396
Amortization of intangible assets	3,429	2,062	8,582	6,363
Loan collection and other real estate owned, net	719	560	1,867	1,828
Acquisition expenses	1,125	543	19,526	543
Other	7,892	6,112	22,332	17,865
Total noninterest expense	111,143	95,745	333,653	277,106
Income before income tax expense	71,825	48,778	149,753	133,911
Income tax expense	17,354	10,681	36,027	29,275
Net income	54,471	38,097	113,726	104,636
Goodwill	454,072	362,010	454,072	362,010	$ 362,663
Intangible assets, net	61,018	35,843	61,018	35,843	36,360
Total assets	16,112,584	13,839,552	$ 16,112,584	13,839,552	$ 13,786,666
Segment reporting, other segment item, composition, description			Included in All Other is the revenue and expenses from certain other non-bank subsidiaries of the parent, including the insurance subsidiary, along with eliminating amounts that do not meet the definition of an operating segment.
All Other [Member]
Financial Information of Reportable Segments [Abstract]
Net interest income	0	0	$ 0	0
Provision for loan losses	0	0	0	0
Net interest income after provision for loan losses	0	0	0	0
Noninterest income [Abstract]
Service charges on deposit accounts	0	0	0	0
Card services income	0	0	0	0
Retirement plan administration fees	(458)	(405)	(1,227)	(1,127)
Wealth management	4	11	23	37
Insurance services	5,260	4,913	14,117	13,148
Bank owned life insurance income	0	0	0	0
Net securities (losses) gains	0	0	0	0
Other	(2,536)	(1,968)	(6,933)	(6,653)
Total noninterest income	2,270	2,551	5,980	5,405
Noninterest expense [Abstract]
Salaries and employee benefits	2,906	2,798	8,394	8,161
Technology and data services	168	151	495	497
Occupancy	75	71	209	187
Professional fees and outside services	(430)	(348)	(1,148)	(1,014)
Office supplies and postage	14	25	43	53
FDIC assessment	0	0	0	0
Advertising	2	13	4	16
Amortization of intangible assets	55	60	171	94
Loan collection and other real estate owned, net	0	0	0	0
Acquisition expenses	0	0	0	0
Other	(2,352)	(1,753)	(6,644)	(6,204)
Total noninterest expense	438	1,017	1,524	1,790
Income before income tax expense	1,832	1,534	4,456	3,615
Income tax expense	0	189	0	356
Net income	1,832	1,345	4,456	3,259
Goodwill	14,536	14,536	14,536	14,536
Intangible assets, net	1,103	1,333	1,103	1,333
Total assets	(1,975,616)	(1,733,227)	(1,975,616)	(1,733,227)
Operating Segments [Member] | Banking [Member]
Financial Information of Reportable Segments [Abstract]
Net interest income	134,643	101,649	366,050	293,962
Provision for loan losses	3,100	2,920	28,489	17,398
Net interest income after provision for loan losses	131,543	98,729	337,561	276,564
Noninterest income [Abstract]
Service charges on deposit accounts	5,100	4,340	13,921	12,676
Card services income	6,389	5,897	17,783	16,679
Retirement plan administration fees	0	0	0	0
Wealth management	10,592	10,384	31,082	29,231
Insurance services	0	0	1	1
Bank owned life insurance income	3,240	1,868	8,817	6,054
Net securities (losses) gains	(2)	476	6	2,567
Other	6,201	4,603	16,832	15,061
Total noninterest income	31,520	27,568	88,442	82,269
Noninterest expense [Abstract]
Salaries and employee benefits	55,447	48,773	157,654	138,247
Technology and data services	10,767	9,508	30,909	27,601
Occupancy	8,742	7,432	26,121	22,521
Professional fees and outside services	5,826	4,752	15,492	13,991
Office supplies and postage	1,936	1,649	5,600	5,117
FDIC assessment	2,262	1,815	5,776	5,217
Advertising	831	661	2,901	2,316
Amortization of intangible assets	2,899	1,562	6,907	4,910
Loan collection and other real estate owned, net	719	560	1,867	1,828
Acquisition expenses	1,125	543	19,526	543
Other	10,007	7,617	28,231	23,244
Total noninterest expense	100,561	84,872	300,984	245,535
Income before income tax expense	62,502	41,425	125,019	113,298
Income tax expense	15,719	9,250	31,687	25,251
Net income	46,783	32,175	93,332	88,047
Goodwill	415,659	324,250	415,659	324,250
Intangible assets, net	53,886	29,062	53,886	29,062
Total assets	18,035,279	15,524,898	18,035,279	15,524,898
Operating Segments [Member] | Retirement Plan Administration [Member]
Financial Information of Reportable Segments [Abstract]
Net interest income	20	20	56	55
Provision for loan losses	0	0	0	0
Net interest income after provision for loan losses	20	20	56	55
Noninterest income [Abstract]
Service charges on deposit accounts	0	0	0	0
Card services income	0	0	0	0
Retirement plan administration fees	16,371	14,983	48,708	44,790
Wealth management	507	534	1,622	1,531
Insurance services	0	0	0	0
Bank owned life insurance income	0	0	0	0
Net securities (losses) gains	0	0	0	0
Other	737	138	1,037	403
Total noninterest income	17,615	15,655	51,367	46,724
Noninterest expense [Abstract]
Salaries and employee benefits	8,283	8,070	25,437	24,330
Technology and data services	245	261	818	821
Occupancy	236	251	788	815
Professional fees and outside services	545	467	1,570	1,312
Office supplies and postage	123	82	243	255
FDIC assessment	0	0	0	0
Advertising	0	37	40	64
Amortization of intangible assets	475	440	1,504	1,359
Loan collection and other real estate owned, net	0	0	0	0
Acquisition expenses	0	0	0	0
Other	237	248	745	825
Total noninterest expense	10,144	9,856	31,145	29,781
Income before income tax expense	7,491	5,819	20,278	16,998
Income tax expense	1,635	1,242	4,340	3,668
Net income	5,856	4,577	15,938	13,330
Goodwill	23,877	23,224	23,877	23,224
Intangible assets, net	6,029	5,448	6,029	5,448
Total assets	$ 52,921	$ 47,881	$ 52,921	$ 47,881