Loans - Credit risk profile by risk grade of acquired non-credit impaired loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Loans
Total loans	$ 11,375,104	$ 11,226,192
Construction and land development
Loans
Total loans	1,017,261	957,346
Other income producing property
Loans
Total loans	346,554	367,353
Consumer Owner Occupied Loans
Loans
Total loans	2,706,960	2,762,266
Commercial loans | Commercial non-owner occupied
Loans
Total loans	2,323,967	2,398,249
Commercial loans | Commercial owner occupied real estate loan
Loans
Total loans	2,158,701	2,047,933
Commercial loans | Commercial and industrial
Loans
Total loans	1,386,327	1,271,464
Commercial loans | Other loans
Loans
Total loans	13,892	1,601
Consumer | Home equity loans
Loans
Total loans	758,020	778,234
Consumer | Consumer
Loans
Total loans	663,422	641,746
Acquired non-credit impaired loans
Loans
Total loans	1,760,427	2,180,281
Acquired non-credit impaired loans | Pass
Loans
Total loans	1,697,942	2,109,875
Acquired non-credit impaired loans | Special mention
Loans
Total loans	39,772	41,016
Acquired non-credit impaired loans | Substandard
Loans
Total loans	22,713	29,390
Acquired non-credit impaired loans | Other income producing property
Loans
Total loans	95,697	111,006
Acquired non-credit impaired loans | Consumer
Loans
Total loans		99,690
Acquired non-credit impaired loans | Commercial loans
Loans
Total loans	985,780	1,294,530
Acquired non-credit impaired loans | Commercial loans | Pass
Loans
Total loans	950,062	1,250,422
Acquired non-credit impaired loans | Commercial loans | Special mention
Loans
Total loans	27,005	28,171
Acquired non-credit impaired loans | Commercial loans | Substandard
Loans
Total loans	8,713	15,937
Acquired non-credit impaired loans | Commercial loans | Construction and land development
Loans
Total loans	33,569	60,391
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Pass
Loans
Total loans	31,690	58,165
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Special mention
Loans
Total loans	966	821
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Substandard
Loans
Total loans	913	1,405
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied
Loans
Total loans	447,441	595,367
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Pass
Loans
Total loans	432,710	583,416
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Special mention
Loans
Total loans	14,162	5,753
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Substandard
Loans
Total loans	569	6,198
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan
Loans
Total loans	307,193	376,187
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Pass
Loans
Total loans	300,678	359,783
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Special mention
Loans
Total loans	3,092	12,841
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Substandard
Loans
Total loans	3,423	3,563
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial
Loans
Total loans	101,880	151,579
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Pass
Loans
Total loans	97,092	145,733
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Special mention
Loans
Total loans	2,948	2,616
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Substandard
Loans
Total loans	1,840	3,230
Acquired non-credit impaired loans | Commercial loans | Other income producing property
Loans
Total loans	95,697	111,006
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Pass
Loans
Total loans	87,892	103,325
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Special mention
Loans
Total loans	5,837	6,140
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Substandard
Loans
Total loans	1,968	1,541
Acquired non-credit impaired loans | Consumer
Loans
Total loans	774,647	885,751
Acquired non-credit impaired loans | Consumer | Pass
Loans
Total loans	747,880	859,453
Acquired non-credit impaired loans | Consumer | Special mention
Loans
Total loans	12,767	12,845
Acquired non-credit impaired loans | Consumer | Substandard
Loans
Total loans	14,000	13,453
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans
Loans
Total loans	496,431	577,284
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Pass
Loans
Total loans	486,433	566,433
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Special mention
Loans
Total loans	6,434	6,749
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Substandard
Loans
Total loans	3,564	4,102
Acquired non-credit impaired loans | Consumer | Home equity loans
Loans
Total loans	188,732	208,777
Acquired non-credit impaired loans | Consumer | Home equity loans | Pass
Loans
Total loans	174,912	196,254
Acquired non-credit impaired loans | Consumer | Home equity loans | Special mention
Loans
Total loans	5,679	5,459
Acquired non-credit impaired loans | Consumer | Home equity loans | Substandard
Loans
Total loans	8,141	7,064
Acquired non-credit impaired loans | Consumer | Consumer
Loans
Total loans	89,484	99,690
Acquired non-credit impaired loans | Consumer | Consumer | Pass
Loans
Total loans	86,535	96,766
Acquired non-credit impaired loans | Consumer | Consumer | Special mention
Loans
Total loans	654	637
Acquired non-credit impaired loans | Consumer | Consumer | Substandard
Loans
Total loans	$ 2,295	$ 2,287