Borrowings (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Short-term Debt

Short-term borrowings at December 31, 2020 and 2019 are as follows:

(Dollars in thousands)	2020		2019
Securities sold under customer repurchase agreements	$	641,487	$	442,956
Notes payable to FHLB of Atlanta	—		255,000
Other short-term debt	—		40,277
Total short-term borrowings	$	641,487	$	738,233

Schedule of Long-term Debt Instruments

Long-term borrowings at December 31, 2020 and 2019 include:

(Dollars in thousands)	2020		2019
Fixed-to-Floating subordinated notes at 3.375% maturing March 15, 2030	$	350,000	$	—
Junior subordinated debenture at 3-month LIBOR plus 1.75% maturing June 30, 2036	88,145		88,145
Junior subordinated debenture at 3-month LIBOR plus 2.25% maturing June 15, 2034	19,588		19,588
Junior subordinated debenture at 3-month LIBOR plus 2.85% maturing April 7, 2034	10,310		10,310
Junior subordinated debentures at 3-month LIBOR plus 2.80% maturing March 30, 2034	14,433		14,433
Junior subordinated debentures at 7.00% maturing December 31, 2026(1)	20,000		20,000
Junior subordinated debentures at 6.50% maturing October 1, 2025(2)	7,500		7,500
Junior subordinated debentures at 7.13% called February 25, 2020(2)	—		5,000
Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032	655,175		317,191
Unsecured term loan at 1-month LIBOR plus 1.10% maturing September 5, 2022	82,125		96,425
Obligations under capitalized leases extending to December 2050	6,308		8,230
Unamortized issuance costs	(3,459)		—
Unamortized purchase accounting adjustments(3)	(1,999)		(1,569)
Other long-term debt	37		3,385
Total long-term obligations	$	1,248,163	$	588,638
(1) Assumed in HomeBancorp acquisition. (2) Assumed in Biscayne BancShares acquisition. (3) At December 31, 2020, unamortized purchase accounting adjustments were $2.0 million for subordinated debentures. At December 31, 2019, unamortized purchase accounting adjustments were $1.6 million for subordinated debentures and $6 thousand for FHLB advances.

Schedule of Maturities of Long-term Debt

Long-term borrowings maturing in each of the five years subsequent to December 31, 2020 and thereafter include:

(Dollars in thousands)	Year ended December 31
2021	$	10,000
2022	98,709
2023	125,500
2024	6,144
2025	7,500
Thereafter	1,000,310
Total long-term borrowings	$	1,248,163