Other Borrowings and Subordinated Notes and Debentures - Debt Components (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total other borrowings and subordinated debt		$ 1,389,853	$ 1,225,285
FHLB advances, net of discount, due 2023 to 2033, 4.56% to 5.53% secured by real estate loans
Debt Instrument [Line Items]
Total other borrowings and subordinated debt		$ 1,003,429	838,487
FHLB advances, net of discount, due 2023 to 2033, 4.56% to 5.53% secured by real estate loans | Minimum
Debt Instrument [Line Items]
Fixed rate (as percent)		4.56%
FHLB advances, net of discount, due 2023 to 2033, 4.56% to 5.53% secured by real estate loans | Maximum
Debt Instrument [Line Items]
Fixed rate (as percent)		5.53%
Other long-term debt
Debt Instrument [Line Items]
Total other borrowings and subordinated debt		$ 20,397	20,809
Total other borrowings
Debt Instrument [Line Items]
Total other borrowings and subordinated debt		1,023,826	859,296
Subordinated Notes
Debt Instrument [Line Items]
Fixed rate (as percent)	5.00%
Subordinated Notes | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Floating rate (as percent)	2.15%
Subordinated Notes | Subordinated notes payable, due 4/1/2028, fixed-to-floating rate (fixed rate of 5.00% through 3/31/2023, floating rate of 2.15% above the three month LIBOR rate, reset quarterly)
Debt Instrument [Line Items]
Long-term debt, gross		$ 330,000	330,000
Fixed rate (as percent)		5.00%
Subordinated Notes | Subordinated notes payable, due 4/1/2028, fixed-to-floating rate (fixed rate of 5.00% through 3/31/2023, floating rate of 2.15% above the three month LIBOR rate, reset quarterly) | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Floating rate (as percent)		2.15%
Subordinated Notes | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly)
Debt Instrument [Line Items]
Long-term debt, gross		$ 37,256	37,285
Fixed rate (as percent)		6.00%
Subordinated Notes | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly) | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Floating rate (as percent)		5.92%
Total subordinated notes and debentures
Debt Instrument [Line Items]
Total other borrowings and subordinated debt		$ 366,027	365,989
Unamortized debt issuance costs		$ (1,229)	$ (1,296)