Borrowings - Borrowings by contractual maturities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Debt Disclosure
2019	$ 135,588
2020	282,814
2021	50,040
2022	103,148
2023	318,251
Later years	489,926
Total borrowings	1,379,767
Assets Sold Under Agreements To Repurchase
Debt Disclosure
2019	70,279
2020	142,818
2021	0
2022	0
2023	0
Later years	0
Total borrowings	213,097
Notes Payable
Debt Disclosure
2019	65,309
2020	139,996
2021	50,040
2022	103,148
2023	318,251
Later years	489,926
Total borrowings	$ 1,166,670