Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 17,127,208	$ 15,686,209
Accruing Loans Past Due 90 Days or More	2,126	6,980
Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	21,957	85,414
Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,150	17,853
Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	185,325	84,982
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	213,432	188,249
Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,913,776	15,497,960
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	9,031,176	8,349,517
Commercial real estate loans \| Non-farm/non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,921,829	5,290,112
Accruing Loans Past Due 90 Days or More	491	0
Commercial real estate loans \| Non-farm/non-residential \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	11,221	37,448
Commercial real estate loans \| Non-farm/non-residential \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	620	4,723
Commercial real estate loans \| Non-farm/non-residential \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	56,562	21,685
Commercial real estate loans \| Non-farm/non-residential \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	68,403	63,856
Commercial real estate loans \| Non-farm/non-residential \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,853,426	5,226,256
Commercial real estate loans \| Construction/land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,780,116	2,726,993
Accruing Loans Past Due 90 Days or More	0	405
Commercial real estate loans \| Construction/land development \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,403	207
Commercial real estate loans \| Construction/land development \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	116	7,208
Commercial real estate loans \| Construction/land development \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,179	5,849
Commercial real estate loans \| Construction/land development \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	9,698	13,264
Commercial real estate loans \| Construction/land development \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,770,418	2,713,729
Commercial real estate loans \| Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	329,231	332,412
Accruing Loans Past Due 90 Days or More	0	0
Commercial real estate loans \| Agricultural \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	134	99
Commercial real estate loans \| Agricultural \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Commercial real estate loans \| Agricultural \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,670	489
Commercial real estate loans \| Agricultural \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,804	588
Commercial real estate loans \| Agricultural \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	327,427	331,824
Residential real estate loans \| Residential 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,545,462	2,134,334
Accruing Loans Past Due 90 Days or More	1,276	2,321
Residential real estate loans \| Residential 1-4 family \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,779	3,709
Residential real estate loans \| Residential 1-4 family \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,576	4,650
Residential real estate loans \| Residential 1-4 family \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	27,531	26,470
Residential real estate loans \| Residential 1-4 family \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	34,886	34,829
Residential real estate loans \| Residential 1-4 family \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,510,576	2,099,505
Residential real estate loans \| Multifamily residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,269,728	1,140,911
Accruing Loans Past Due 90 Days or More	0	0
Residential real estate loans \| Multifamily residential \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	152	0
Residential real estate loans \| Multifamily residential \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate loans \| Multifamily residential \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,391	10,925
Residential real estate loans \| Multifamily residential \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,543	10,925
Residential real estate loans \| Multifamily residential \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,257,185	1,129,986
Total real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,846,366	11,624,762
Accruing Loans Past Due 90 Days or More	1,767	2,726
Total real estate \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,689	41,463
Total real estate \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,312	16,581
Total real estate \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	106,333	65,418
Total real estate \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	127,334	123,462
Total real estate \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,719,032	11,501,300
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,278,008	1,253,746
Accruing Loans Past Due 90 Days or More	16	3,290
Consumer \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,383	1,251
Consumer \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	88	210
Consumer \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,154	13,616
Consumer \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,625	15,077
Consumer \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,262,383	1,238,669
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,285,054	2,222,401
Accruing Loans Past Due 90 Days or More	331	964
Commercial and industrial \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,685	41,433
Commercial and industrial \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	439	1,048
Commercial and industrial \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	65,558	4,724
Commercial and industrial \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	67,682	47,205
Commercial and industrial \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,217,372	2,175,196
Agricultural & other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	717,780	585,300
Accruing Loans Past Due 90 Days or More	12	0
Agricultural & other \| Loans Past Due 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,200	1,267
Agricultural & other \| Loans Past Due 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	311	14
Agricultural & other \| Loans Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,280	1,224
Agricultural & other \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,791	2,505
Agricultural & other \| Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 714,989	$ 582,795